I gotta say that I'm impressed with the game. It really does play just like Halo 2, but that is not a bad thing. The LFE is really pretty impressive on my SVS PB12 NSD.
There is one thing I am disapointed in, and that is the jaggies. I had to double check to make sure I hadn't set the resolution to 1080i last time I traveled with my xbox. I was playing on a 56" 720P samsung DLP from 8-10 and the jaggies were really bothersome. Oh well, I'm sure after a few more days I'll get used to it.