I'm more in love with gaming and the quality/variety of games now than I ever have... maybe the best it has been since the 16-bit generation. IMO, anyway.
I know it's cliche and overdone, but seriously, first post nails it. I find that my anxiety and frustration levels climb when I hang out on GAF too much or read comments elsewhere. There's a general tendency towards negativity that gets old really quick. I don't know what it is about the human condition that compels groups to be that way (misery loves company, maybe?), but if it bothers you that much, maybe just walk away from the things that annoy you, just like in other aspects of life.