I read a lot of book reviews. It’s part of my job, obviously, but it’s also a habit I’ve had since college, when I started paying attention to what critics said about books and why. Over the years, I’ve developed a fairly sensitive radar for the difference between a review that’s genuinely trying to help me decide whether to read a book and a review that’s serving some other purpose entirely. Not all reviews are created equal, and knowing how to tell them apart can save you a lot of time and money.

Before I get into specifics, let me say that I think book reviewing is valuable work. A good review is an act of critical thinking that helps readers navigate an overwhelming number of choices. Roughly 500,000 new titles are published in the United States every year. No one can read even a fraction of them. Reviews help readers find the books that are worth their time and avoid the ones that aren’t. That’s a useful function, and the people who do it well deserve more credit than they usually get.

That said, not every review is trustworthy, and the reasons vary. Some reviews are compromised by conflicts of interest. Some are poorly executed. Some are driven by agendas that have nothing to do with the book being reviewed. Learning to spot these problems will make you a smarter consumer of criticism and, ultimately, a smarter reader.

The Problem of Paid Reviews

Let’s start with the most obvious credibility problem: paid reviews. In the self-publishing world, there’s a thriving industry of services that will write positive reviews of your book for a fee. Some of these services are reasonably transparent about what they offer. Others are essentially fake-review mills that post glowing five-star reviews on Amazon and Goodreads without disclosing that they were paid to do so.

The existence of paid reviews has eroded trust in online book reviews generally, and understandably so. When you look at a book on Amazon and see dozens of five-star reviews, you can’t be sure how many of them are genuine and how many were purchased. Amazon has taken steps to combat fake reviews (removing obvious fakes, requiring verified purchase for some review features), but the problem persists. It’s an arms race between the platforms trying to maintain integrity and the sellers trying to game the system.

How do you spot a paid review? There are some common tells. Paid reviews tend to be vague about the book’s actual content, focusing instead on general superlatives (“Amazing! A must-read! Life-changing!”) without specifying what, exactly, was amazing about it. They tend to be short, often just a few sentences. They tend to appear in clusters, with multiple five-star reviews posted within a short time frame. And they tend to come from reviewer accounts that have reviewed a suspiciously large number of books in a short period, often across unrelated genres.

Genuine reviews, by contrast, tend to be specific. A real reader who loved a book will usually mention particular aspects that appealed to them: a specific character, a particular plot development, the quality of the research, the clarity of the explanation. They’ll often mention something they didn’t like, too, because real reading experiences are rarely uncomplicated. A review that’s all praise with no specifics should raise your skepticism.

The Blurb Economy

Blurbs, those short endorsements printed on book jackets from other authors or public figures, occupy an ambiguous space between recommendation and marketing. They look like reviews, but they function differently. A blurb is solicited by the publisher, which means the author or publisher chose who to ask and which blurbs to use. You’re seeing a curated selection of the most positive responses, not a representative sample of opinion.

This doesn’t mean blurbs are worthless. If an author I trust and admire endorses a book, that carries weight with me. The blurber is putting their reputation on the line by associating their name with the book, and most authors won’t blurb a book they don’t genuinely think is good. But there’s a spectrum. Some blurbs are the result of genuine enthusiasm; the blurber read the book, loved it, and was happy to say so. Others are the result of social obligation: the blurber is a friend of the author, or they share an agent, or they owe a favor. The quality of the blurb often reflects which scenario applies.

You can sometimes tell the difference by reading the blurb carefully. A blurb born of genuine enthusiasm tends to be specific and vivid, mentioning something particular about the book that the blurber found compelling. A blurb born of obligation tends to be generic, the kind of praise that could apply to almost any book: “A stunning achievement. Beautifully written and deeply moving.” Those words could describe a thousand different books, which means they don’t describe any of them.

Professional Reviews vs. Consumer Reviews

There’s an important distinction between professional reviews (published in newspapers, magazines, and literary journals by trained critics) and consumer reviews (posted on Amazon, Goodreads, and social media by ordinary readers). Both have value, but they serve different purposes and should be evaluated differently.

Professional reviews are written by people who read widely, have some expertise in literature or the book’s subject matter, and are accountable to an editor and a publication. A review in the New York Times, the Washington Post, or the London Review of Books has been through an editorial process that provides a basic quality check. The reviewer was chosen for their knowledge of the relevant genre or subject. The review was edited for clarity, accuracy, and fairness. This doesn’t guarantee that the review is right (critics can be wrong, and frequently are), but it does guarantee that the review is at least competent and considered.

Consumer reviews, on the other hand, have no quality filter. Anyone can post a review on Amazon or Goodreads, regardless of whether they’ve actually read the book, and there’s no editor to catch errors or challenge unfair assessments. This means consumer reviews are more democratic (everyone’s voice counts equally) but also more chaotic (some voices are uninformed, dishonest, or driven by personal grudges).

I use both types, but differently. I read professional reviews for informed, nuanced assessments of a book’s quality and significance. I scan consumer reviews for patterns, specifically what multiple readers consistently praise or criticize. If twenty different Amazon reviewers independently mention that the book’s pacing slows down in the middle section, that’s probably a real issue, regardless of what any professional critic said.

How to Read a Professional Review

Even professional reviews should be read critically. Here are some things I look for when evaluating whether a professional review is trustworthy.

Does the reviewer seem to have actually read the book? This sounds like a low bar, but you’d be surprised how many reviews are essentially extended riffs on the book’s topic rather than assessments of the book itself. A reviewer who spends most of the review discussing their own opinions about the subject, without engaging with the author’s specific arguments or narrative choices, may be using the book as a springboard for their own commentary rather than evaluating it on its merits.

Does the reviewer acknowledge the book’s intended audience? A negative review of a beginner’s guide to investing that criticizes it for not being sophisticated enough for finance professionals is a bad review, because it’s evaluating the book against the wrong standard. A good reviewer identifies who the book is for and assesses how well it serves that audience. This is one of my biggest pet peeves in book criticism: reviewers who fault a book for not being the book the reviewer wanted instead of evaluating the book the author wrote.

Does the reviewer provide evidence for their judgments? A review that says “the prose is clumsy” without quoting or paraphrasing any examples is asking you to take the reviewer’s word for it. A review that says “the prose is clumsy” and then shows you why, by pointing to specific passages and explaining what doesn’t work about them, is giving you the tools to evaluate the claim for yourself. Evidence-based criticism is more trustworthy than assertion-based criticism, always.

Is the reviewer’s perspective transparent? Every critic has preferences, biases, and blind spots. A reviewer who prefers spare, minimalist prose may undervalue a book with lush, maximalist writing, not because the book is bad but because it doesn’t match the reviewer’s taste. The best critics are aware of their preferences and account for them in their reviews, either by disclosing their biases or by evaluating the book on its own terms rather than their personal ones.

The Star Rating Problem

Star ratings (one to five stars on Amazon and Goodreads) are probably the least useful form of book review, and yet they’re the form that most people rely on. The problem is that star ratings compress a complex, multidimensional assessment into a single number. A three-star rating could mean “decent but not memorable” or “alternately brilliant and terrible” or “not my genre but objectively well-done.” You can’t tell from the number alone.

People also use star ratings inconsistently. Some readers reserve five stars for absolute masterpieces and give most books three or four stars. Others give five stars to any book they enjoyed and one star to any book they didn’t. Some people rate books they haven’t finished. Some rate books they haven’t started, based on the author’s politics or a controversy they read about online. All of these ratings get averaged together into a single number that supposedly tells you how good the book is.

My advice is to ignore the aggregate star rating almost entirely and instead read the actual reviews, particularly the three-star reviews. Three-star reviews are often the most useful because they tend to come from readers who had mixed feelings and are trying to articulate what worked and what didn’t. They’re less likely to be driven by extreme enthusiasm or extreme disappointment, and they usually contain the most nuanced assessments of the book’s strengths and weaknesses.

Red Flags in Book Reviews

Here are some specific red flags that I watch for when evaluating book reviews, whether professional or consumer.

The review focuses on the author rather than the book. If a review spends more time discussing the author’s personal life, political views, or social media behavior than the actual content of the book, it’s not really a book review. It’s a character assessment disguised as criticism. This has become more common in the age of social media, where authors are public figures whose every statement is scrutinized. An author can be a terrible person and still write a good book. A review that conflates the two isn’t helping you decide whether to read the book.

The review is suspiciously similar to other reviews. On platforms like Amazon and Goodreads, you’ll occasionally notice multiple reviews that use the same phrases, make the same points in the same order, or have an uncanny similarity of tone. This can indicate coordinated reviewing, whether by a paid review service or by an organized group (fan communities sometimes coordinate positive reviews; opponents of an author sometimes coordinate negative ones). If several reviews read like they were written from the same template, something is off.

The review was posted before the book was available. On Goodreads, people can rate and review books before they’re published. While some of these early reviews come from people who received advance copies, many are based on nothing more than the book’s description, the author’s reputation, or the reviewer’s political feelings about the subject matter. A one-star review posted three months before publication is not a review. It’s a prediction, or a grudge.

The review contains factual errors about the book. If a reviewer gets basic facts wrong, like the setting of a novel, the central argument of a nonfiction book, or the names of major characters, that’s a strong signal that they either didn’t read the book carefully or didn’t read it at all. Professional reviewers are generally more careful about factual accuracy, but mistakes happen. When they do, they undermine the credibility of the entire review.

The Role of Social Media Reviews

Social media has created a new category of book review that doesn’t fit neatly into either the professional or consumer bucket. BookTok on TikTok, Bookstagram on Instagram, BookTube on YouTube, and book-focused accounts on Twitter/X all produce content that functions as reviewing even when it doesn’t look like traditional criticism. A 60-second TikTok video of someone crying over a book’s ending and urging their followers to read it is, functionally, a review. It communicates an emotional response and a recommendation.

These social media reviews have enormous commercial influence. A single viral BookTok video can move thousands of copies. But they should be evaluated with the same critical eye as any other review. Is the reviewer being compensated? (Some bookstagrammers and BookTok creators receive free books from publishers, and while this doesn’t automatically bias their reviews, it’s worth knowing about.) Is the reviewer’s reading diet broad enough that their recommendations reflect genuine discernment, or do they enthusiastically recommend every book they read? Does the reviewer ever post negative or mixed reviews, or is everything they share overwhelmingly positive? A reviewer who loves every single book they read either has extraordinary taste in selecting books or is not being entirely honest.

I also pay attention to whether social media reviewers engage with the content of the book or just the experience of reading it. “I could not put this book down” tells me about the reviewer’s experience but nothing about the book’s quality. “I could not put this book down because the dialogue between the two leads was so sharp and funny that I kept reading just to see what they’d say next” tells me something specific and useful. The more specific the praise (or criticism), the more helpful the review.

Building Your Own Review Literacy

The most important thing you can do to become a better evaluator of book reviews is to read widely and develop your own critical sensibilities. The more books you read, the better you get at predicting which ones you’ll enjoy based on limited information. Over time, you’ll find reviewers whose tastes align with yours, and their recommendations will become more reliable than aggregate ratings or bestseller lists.

I have a handful of critics whose judgment I’ve learned to trust over years of reading their work. When one of them praises a book, I’m much more likely to buy it than if it has a 4.5-star average on Goodreads. This isn’t because those critics are objectively correct and thousands of Goodreads reviewers are objectively wrong. It’s because I’ve calibrated my expectations to those particular critics’ perspectives. I know their biases, their preferences, and how their tastes overlap with mine. That personal calibration is more valuable than any algorithmic recommendation.

Finding your trusted critics takes time, but it’s worth the investment. Start by paying attention to which reviewers’ recommendations consistently lead you to books you enjoy. Follow those reviewers, whether they’re professional critics or social media personalities. Over time, you’ll build a personal network of voices you trust, and navigating the overwhelming number of books available will become much easier.

I’d also encourage you to write reviews yourself, even if just for your own records. The act of articulating what you liked or didn’t like about a book forces you to think more carefully about your reading experience. It sharpens your critical thinking and makes you a more attentive reader. You don’t have to post your reviews publicly (though platforms like Goodreads benefit from thoughtful, honest reviews). Even a private reading journal where you write a few sentences about each book you finish will improve your ability to evaluate both books and reviews of books.

At ScrollWorks Media, we’re always grateful for honest, thoughtful reviews of our titles. Whether you’re reviewing The Last Archive, Echoes of Iron, or Bitcoin for Absolute Beginners, we want to hear what you actually think, not what you think we want to hear. That’s how books find their real audience, and it’s how readers find the books that will matter to them. Browse our full catalog and let us know what you think.