Random thought on reviews

As I have less time to read (and read fewer professional reviews, not being in the library world), I've been thinking a lot about what makes a book review useful to me. What I like best is when the reviewer situates the review for me along several axes.
I want to know whether the reviewer did or didn't like the book.
I want to know what the reviewer thought the book was trying to do AND/OR what the reviewer came to the book looking for.
AND
I want to know whether the reviewer thinks the book did a good job at what [the reviewer thinks] it was trying to do.

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