That he loves big, muscular, musical black men? Or Gears of War?
Anywho, its an awesome piece of hardare, so long as you don't have a glitchy one. XBL is fantastic for content delivery, worht checking out of you got a Trial Card.
The new Rainbow 6 is decent, got

in common with Gears.
I'd suggest that and the following:
Ghost Recon- excellent split screen and online support, great game SP.
Fight Night 3- probbaly the best fighting game i have ever played, and yes, I think I like it more than Soul Calibur)
Call of Duty 2 as a rental, then Call of Duty 3- Both excellent WW2 games, CoD3 has better ionline multi, both are really well done sp.
Oblivion- if you didn't have a PC that could run this, now is the time to get it. It runs like butter on the 360
Test Drive Unlimited- I think this is my favorite racer, NFSMW is good, and so is PGR3, but Test Drive seems to have so much more to do. You'd be well served with any of those 3 racers
Rockstar's Table Tennis- Yes, I said it. Its not a particularly deep game, but its really well executed and you should be able to find it cheap, and the online multiplayer is done really well.
Other stuff I have played:
I enjoyed The Outfit, but its short and not terribly complicated. Quake 4 was good if you liked earlier Quake games, mostly for hte old school multi, and the bonus disc has Quake2 which you can play 4 player split screen. Far Cry is decent. I'd avoid Perfect Dark Zero.

of people like Chromehounds, but the single player was abyssmal, and you kinda had to play it to unlock the stuff in multi. I thought Dead or Alive 4 was really sub par, only get it if you are a fan and like soft core porn. Its just not that good a game.
Of course, now you have access to the Halo2 and a bunch of older Xbox titles (Crimson Skies, etc).