I'd be on the Damny bandwagon as well if someone hadn't gone and ruined it for me.

I personally like Infinity, but it's too damn big. 16 players is just barely enough for it, but playing it effectively requires teamwork; something the average pub scrub fails at.

Chill Out is a fucking grenade spamfest, as is Rat Race. Worst goddamn maps to play on if the server op turned on infinite grenades.

Chiron is fucking awesome once you realize how the layout works, which is something the average Halo player can't be assed to do.

Sidewinder is good imho.