Eh HaloGAF is what the members make it. Obviously the newer games have lessened the appeal of the franchise. But it's not just HaloGAF, I bet every Halo community has seen a drop in members. I'd love for Wu to tell me the page hits HBO got during Halo 2 and 3 and the community interaction and then during Reach and Halo 4.
If people want to ignore dozens and dozens of posters so they can see the one or two posts that their friends make, more power to them. I've got a whopping one person on my ignore list. I read every single post here just like I did when I was lurking. That was the point of this community and thread. To talk Halo, to play Halo, to talk about the future of Halo.
So while I lament at the loss of the 'old guard' and don't blame them for leaving, saying this place is shit now is pretentious. This is what the current Halo community is, good or bad. A lot of people still make great posts here, and bringing in new members is the lifeblood of any community.
I wish a lot of the folks who posted in Plywood's thread about the gamasutra post mortem article would post here, always nice to get new perspective.
But I won't deny the games have something to do with it. We're on OT16 now, and very few members are still playing the games.
I've been lurking since the Halo 3 days, I've seen the shift in community interaction and negativity.