That's not really the issue here, though. The issue at hand is that there are certain posters who always have something negative to say no matter what the subject of the post happens to be.
It defeats the purpose and the point of this board to go raining on everyone's parade just for the sake of being contrary. It's fine if you don't like Hoovers because you bought one once, and the salesman promised you it would do A, B and C, but you got it home and it did X, Y and Z and it left your house dirtier than before. That's fair enough; I could see why you'd never buy another one and go with an Electrolux or a Dyson instead.
It's quite another to go into the "Hoover lovers only" thread and say you've never used a Hoover, but you have no interest in ever using one anyway, because they suck (pun completely intentional) and no one in their right mind would use one, and that's your opinion and by deity you are going to express it if it is the last thing you do. And you do the same in the Beer Lovers Only thread, and the Sci-Fi Lovers Only thread, and the Star Wars Fans only thread...and every other thread that has something you hate, which is apparently everything up to and including puppies, rainbows and little fluffy clouds.
It's irritating, it's counterproductive, and no one really cares about your negative opinions if you have no reason to dislike something apart from your dislike of everything under the sun. Either find something of value to contribute or don't contribute at all, but raining on everyone's parade just for the sake of being contrary isn't very cool.