Halo or Grand Theft Auto
Oops... Mine wasn't a real vote. Just a heavy thumb at 2 am.
Never played either one. Don't game at all, outside of the occasional Madden or NCAAF with buddies.
Ain't nobody got time for that!
(Although it seems like fun if I had time)
Halo. I'm a long time fan of Bungie, and love their blend of artistry and gameplay. Now that it's in M$ hands, though, all bets are off.
Going with GTA not because I've played either one, but because I got sick and tired of disciplining students for trying to download Halo into school computers during my first year teaching. Which was still better than the kid who was breaking into classrooms and viewing porno. Eww.
Kids gotta do...