I read most of them. A good review always feels nice. With bad reviews, I try to look for anything that might help me to improve moving forward. Otherwise, I tend to look at them as just part of the process. Sometimes it's clear that the reviewer was expecting the book to be something it was never intended to be, and perhaps didn't even read the book description; in those cases, I don't pay much attention unless there's something that should be added to the description to make it clearer.