Also Farcry 2 and Call Of Duty 4 are good.
Newer games then maybe Killzone but it does get a bit repetative.
Go onto Gamespot and check out the top 10 lists. GTA4 is still the best game ever made if he hasn't got that, although it's not child safe obviously :)
(, Mon 8 Jun 2009, 15:11, archived)
he has gta4... jesus he has a lot of games :P
(, Mon 8 Jun 2009, 15:13, archived)
he mostly has games on the 360.
(, Mon 8 Jun 2009, 15:17, archived)