Here are a couple of bugs that I’ve noticed and haven’t seen posted on the forums yet. Just putting them out there for the awareness:
Using the Kinect as a mic for the in-game chat doesn’t work / There’s no option to have voice output to speakers.
and
You can’t change teams in the middle of a custom game (key for Halo 2 Classic Zombies/Infection) even when forced team balance is off.