Originally Posted by
Mellrod
Because thinking something looks good is personal opinion, and no one can really debate you on the fact that you're looking forward to something. If you think something looks bad and your evidence or argument for such isn't reliable (say, because the game is still in development and subject to change), then that's something people can talk about.
Also, negativity can be pretty non-constructive too. I can't tell you how many ignorant rants, childish hissyfits, and amount of times WoW has "died" that i've seen over years of forum lurking.