I gad GTA IV on order. 20 minutes later, I loaned it to a friend.
Free advice: pick up a used copy of Gears of War. I grew addicted to the online, playing two or three hours a night. Had 64 people on my Live friends list who also were into team play- it was awesome. Stood in line for Gears 2, which isn't so awesome for online play.
People now seem to use their XBOX as a Netflix player.
I'm currently playing Dead Space, which is pretty good- very Half Life 2-esque.
I still love to get on and play Gears 1 online, though.