A review that will not say whether the thing is worth your time is not a review. It is a description.
The verdict block is the most argued-over part of the format. Here is why it is mandatory, why it is a number and not stars, and why "selectively" exists.
Not the bestsellers, not the canon, not what we happened to read. A book earns a brief when the argument around it is worth fifteen minutes.
The Books vertical does not cover everything. This is the selection rule, the two lists a title has to pass, and why a book we dislike can still earn a brief.