Book reviews can become weak when most of the writing is spent retelling the plot or summarizing each chapter. A stronger review should explain what the author is trying to achieve, evaluate how well the ideas or arguments are developed, and support that evaluation with specific examples from the text.
I've found that it helps to separate summary from analysis. A short overview gives context, but most of the paper should focus on themes, evidence, strengths, limitations, writing style, and the overall effectiveness of the book.
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Another useful step is deciding on your overall evaluation before drafting, because that gives the review a clear direction instead of becoming a collection of unrelated observations.
What part of writing a book review do you find most difficult: avoiding too much summary, developing criticism, or supporting your evaluation with evidence?