I use the NO button. If it isn't helpful at all or seems like the person is talking about something completely different, I hit NO. It's not that they are abusive but I have seen a "review" say "This book was great" under a shampoo heading. Um, what? No idea if the NO vote does anything though. Wish I knew how many I have. I know some people vote No when they disagree with me. (Usually new people who sign up to yell at me.)