It tends to be the nature of Internet forums that people air their complaints and problems and rarely make a post just say something nice. Just because it is what you see posted here doesn't mean people feel mostly like that, we all have bad days and need to air stuff a bit. Living far from 'home' there are not many outlets.
Yes.
In fact many members (*myself included) do post some positive comments. Just take Hybrid Ambassador!
The "dialectical" nature of internet forums makes it that those threads do not receive as many replies as negative ones and thus never achieve the threshold of thread success that is defined by Godwin's Law.