I think it's the nature of forums to have negativity. People generally come to forums when they have problems, people that wouldn't normally post on forums. It's rare to see a normal customer who's satisfied with a product posting on a forum to say how everything is fine, as nothing would really be gained from it. If there is a problem people will post to find out what's going on, if other people have experienced it, and if it can be fixed.

Plus some people just like trolling.