It may be big but there's alot of junk on there, I'm referring mostly to the people posting, though there are very many smart people there are also a lot of unenlightened individuals. When any site gets a lot of exposure that's bound to happen.
So far it seems like Project Avalon Forums have attracted the right kind of people (intelligent and openminded) and that's definitely a rarity with these type forums. Just hope it lasts.