Manu hits on something that I often struggle with, rating books. I rarely do, and most of the books I rate are 4/4.5 stars, I agree with him when he says

I think Netflix got it right with its thumbs-up, thumbs-down system, with the extra option to give something two thumbs up if you really liked it. Anything more complex than that feels a bit like overkill to me because what’s the difference between 3-star and 3.5-star books?

I also don’t know the difference between a 3 and 3.5 star or 3 and 2 star book. If I didn’t like a book enough to give it a low rating, chances are I haven’t finished it and never will. That says enough to me. I either liked it and finished it, or I didn’t and I abandoned it.