I know that we all hate them. We don't like to read them and I think the majority of us really don't like to write them because we've become friends with the authors. Some may skirt the issue or post what they liked about a book. I feel I cannot be honest to myself if I don't explain why I didn't like the book. I would never attack an author (and I hope that in any of my posts that has never happened) and criticize the author for decisions a character makes or does, etc...
Sometimes all it takes is a continuity error that I can't seem to get over. Maybe it has to do with clunky writing and dialogue (Now grant it these are advance copies I'm reading, it's bound to be in there!). Or it just doesn't sing to me. Some books have bored me in the past. It happens.
Finally three years ago, I decided that I would it another chance. Yep, the first 100 pages bored me to tears, but I stuck with it and I'm happy I did because I actually really enjoyed it! Now, me and my mom do not have the same taste in books at all. I always preferred good literature whereas she read those cheesy romance with Fabio on the cover.
Sometimes you have to go back to a book during a different time in your life to enjoy it. So a book I may not enjoy right now, I might enjoy the finished version or I might enjoy it two years, five years, 10 years down the road.
I don't like writing negative reviews. But sometimes I have to.