If he has a PS2, get Urban Chaos: Riot Response. It came as a demo when I rented Hitman: Blood Money, and I fell in love with it. Probably the best console FPS of the last generation that I played, underrated as all get out, and it's in a close race for my favorite PS2 game. You play as a police officer against a gang of criminals and vandals called the Burners. Basically guys wearing hockey masks who like shooting people and throwing molotov cocktails. The fun part is that based on the difficulty, and if you decide to kill people, or taser them and arrest them you earn points that unlock new weapons, upgrades, new armor, etc. The riot shield was also interesting, blocks most shots and you can smash people in the face with it, years before CODMW2 did it. The achievements reaching certain goals add a lot to the replay value though, different missions have different criteria, and most of the rewards are useful. Reminded me of GoldenEye.