I can tell that a lot of people here use the Forums because they're an interesting read, for something do or just drama. I use many forums, So I'd recommend decent ones.
[url=http://sep7agon.net/gaming/]Sep7agon[/url]
[url=http://www.haloarchive.com/forum/forum/26-general-discussion/]Halo Archive[/url]
[url=https://community.bethesda.net/welcome#externalIdentityManager]Bethesda.net[/url] - It's rather new.
[url=http://www.thehaloforum.com/forum]The Halo Forum[/url]
- And as the Ninjas Know, I post daily here, so this is not advertisement, just recommendations.