I'm kind of torn on the DNF reviews as I have left a couple myself. Usually after several chapters at least though. On the one hand, if I'm leaving the review

I'm kind of torn on the DNF reviews as I have left a couple myself. Usually after several chapters at least though. On the one hand, if I'm leaving the review because I disagree with the author of a nonfiction book, that's obviously not cool. But (this usually applies to novels but sometimes nonfiction too) if the book is badly written trash and I want to save other people from the wasted hours I just put in, a DNF review seems reasonable.