I'd say everybody should just accept the critisism directed to their favorite console, even if the poster only has negative poits to say in his/her post.
Usually in these "Wow gameXXX for consoleXXX looks wickked cool shiit!!" the positive things are already said in the first few posts, is there really point in repeating the same "OMG this looks AWESOME!!!" in every third post.
True, the threads turn as quickly into repeating the negative points, but everybody has their personal bias, whether it's for the console or just that particular game in general.
But the good points are usually more ovious and quickly noticed by everyone that has interest, while the negatives are often easier missed in the hype and excitement or just plain "swept under the carpet"
For example, I am a fan of Metal Gear Solid, so it's natural to me post more positive things in the MGS4 thread than it is in Gears Of War thread, which I can not be a fan of as the game remains unproven apart from screenshots and videos, and probably will remain to me, as I plan to buy only one next gen console.
Personally, I find it more annoying when the thread starts with just some uncritical praise, sounding like some bad PR, than the pointing ot flaws that unavoidedly follow.
Maybe if people actually read the threads before posting, so there would be less same things repeated over and over, which son starts to look like trolling.