Some thoughts: Games sites, (especially game dev sites) suffer from a horrendous signal to noise ratio. We tend to have a very large, well-meaning but uninformed audience who enjoy participating in discussions but do not offer much experience or insight. If you want your site to offer something of value, you'll need some way to manage the signal-to-noise ratio to ensure that good posts are not drowned out.

Another thing to bear in mind is that game development is not the same as Game Programming. There are many skills that must combine in order for a game to be successful; Code, Art, Design, Audio, Biz, etc. Many gamedev sites focus on one or more of these disciplines; very few offer useful discussions on all of them.

The best site for game developers is probably www.thechaosengine.com . They have forums for all of the major disciplines and they manage their S/N by requiring members to vouch for each other before being allowed into the main industry forums.