One of the awesome things from Halo: Reach that I absolutely loved to play in custom games more than infection was Chess. Especially, a halo themed chess!
I would play it occasionally, but it would probably be very unpopular.
that was pretty cool. I mean bungie had managed to add AI to Multiplayer. now that you speak of it I have not long though about it. I am not sure if it will return as a 343 product but maybe a community