A one-star review that says "boring" tells a reader nothing. A three-star review that explains where the book sagged, why the ending rescued it, and who should still buy it tells them almost everything. The gap between those two is where most reviews of self-published books either earn trust or lose it.

Self-publishing puts authors and readers unusually close together. The person whose book you are about to assess has read every line of the listing, checked the ranking, and probably knows your name from a forum. That closeness does not change what makes a review useful. It just raises the stakes on getting it right.

A review is an argument, not a verdict

Weak reviews are rarely cruel. They are vague. "The characters were flat" is a verdict with nothing behind it. "Ruth makes three decisions in the first fifty pages that she never explains, and by the time her secret came out I had stopped caring what it was" is an argument a reader can weigh. One of those helps someone decide whether to spend £8.99. The other just adds a number to a pile.

Tell the reader what the book is trying to do before you judge whether it manages it. A cosy crime novel with a body in the first chapter and a village fête in the third is not failing at psychological realism. Judge it against its own ambitions, then say plainly how far it gets.

Star ratings: decide what yours actually mean

Five stars means "one of the best books I have read this year" to one reviewer and "I finished it without throwing it at a wall" to another. Multiply that confusion across a review page and the stars stop carrying information.

Fix it by publishing your own scale. One line at the foot of a review, or a short note on your blog's about page, is enough: something like "five stars goes to books I would press into a stranger's hands; three means I finished it happily enough and would not rush back". Then stick to it. If you use half-stars, use them consistently. If you never award fewer than four, readers will quietly discount everything you write.

The inflation problem

A wall of five-star reviews with no reservations reads like marketing copy, and readers know it. A thoughtful four-star review that names one genuine flaw is more persuasive than ten raves. Save the top mark for the books that deserve it and you make it mean something when it appears.

Ethics: disclose, don't disguise

Disclosure is not an admission of bias. It is information the reader needs in order to judge how much weight to give your opinion. State it in a line at the top and then get on with the review.

• Whether you received a free copy, and from whom: the author, a publicist or a review platform.
• Whether you know the author at all, even slightly, through a forum, a newsletter or a previous conversation.
• Whether you read the whole book, and in which format. An audiobook performance is a different experience from the printed page, and it is fair to say so.
• Whether anything of value changed hands. Retailers' review policies generally prohibit reviews posted in exchange for payment or a promised rating, so read the current rules before you post.
• Whether you abandoned the book, and roughly where. A review of the first ninety pages is still useful, provided you say that is what it is.

Two practices are worth avoiding altogether: swapping reviews with other authors on the understanding that both will be positive, and posting a review of your own book under another name. Both are easy to spot and expensive to live down. Reviewers can also decline. If you cannot be fair to a book by a friend, say nothing at all.

Spoilers and the patience of the British reader

A review that opens with the twist in chapter twenty-nine has taken something from the reader that cannot be given back. Describe the machinery, not the outcome. Instead of "the sister has been lying about the will", try "the middle section turns on a document whose provenance you will want to check twice". The second version makes a reader curious. The first one closes the book for them.

Give a clear spoiler warning if you must discuss the ending, and keep it below the warning so people can stop reading. Do not pad the review with a plot summary either. Three hundred words of synopsis with a verdict tacked on the end is the most common filler in book blogging, and readers skim straight past it.

How to criticise the book without attacking the author

1. Describe the effect on you, not the author's intention. "I lost track of who was speaking in the dinner-party scene" is concrete. "The dialogue is clumsy" is a judgement dressed up as a fact.
2. Point to a specific moment. A chapter, a scene, a recurring habit in the prose. Specificity is what makes criticism feel fair rather than personal.
3. Separate craft from taste. Plain, unfussy prose is a style; boring prose is your reaction to it. Say which one you mean.
4. Suggest what would have helped, if you can. You are not obliged to solve the book, but a sentence about the fix shows you engaged with it.
5. Stop at the book. Never the author's appearance, their politics, their decision to self-publish, or the price they set.

One point on editing. Self-published books often reach readers with rougher copy-editing than trade editions, and it is fair to mention it once, briefly, as part of your overall impression. Returning to it three times turns a review into a grievance.

Praise that readers believe

Overstatement is the quickest way to lose a British reader. Words like "breathtaking", "unputdownable" and "a masterpiece" belong on a cover, not in a review, and most people have learnt to read straight past them. Specific praise travels further. "I read the last four chapters standing up in a kitchen" says more than any adjective. So does a comparison to books you genuinely know.

Understatement works here too. "Quietly good", "better than it needed to be", "I will look for the next one" all land with more force than a row of exclamation marks. Say what the book did to you and let the reader draw the conclusion.

Before you press publish

A short check takes two minutes and improves almost every review:

• Is there a line at the top explaining how you came by the book?
• Would a stranger know whether to buy it?
• Have you quoted briefly and attributed anything taken from the text?
• Have you said what the book was attempting before judging whether it worked?
• Would you be comfortable if the author read it aloud?

Reviews are a service. Done well, they guide readers towards books they will love and give authors an honest sense of what landed. If yours does both, the star rating at the top will take care of itself.

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