Its not for me, my dad bought one. He asked if I know of any good games for it, I only know the ones that are on the PC. Apart from Gears of War and Halo I dont know of any others that are exclusive for the 360.
I enjoyed Halo Reach although I seem to remember the original looked better, enemies in the distant looked odd. Picked up the controls ok, I do have one of those controllers for my PC. But I just couldn't get used to it, took ages to turn around and overshot the target with the cross-hairs alot, so I ended up jumping from one side of the enemy to the other. My dad was terrible he kept falling on cliffs, his grandson was alot better.
Batman Arkham Asylum had crossed my mind, but its 2 years old, I did suggest Super Street Fighter, you have to have a fighting game if you own a console.
He like strategy games, loved the Civilisation games and Total War games, but I dont know of any similar on the xbox. I think hes also looking for stuff a 12 year old would like, so Brandon can play when visiting. Oh and me I can play when I'm visiting too.