[quote name='MillerTime2523']I reccomend any of the MOH games, possibly Metal Gear: Twin Snakes if hes into the action/adventure type of shooters - even RE4 for the cube if your not talking about FPS.
If you are talking about just FPS's - Look into either of the timesplitters games. And yes, he will probably enjoy gun.[/quote]
I second these recommendations. Although I can't vouch for the quality of the Medal of Honor games, I would recommend Resident Evil 4 as one of the best games I've ever played. Metal Gear Solid: Twin Snakes is another amazing game, although it is more about sneaking than it is about shooting. If he enjoys the war aspects of the game, he will probably find the plot of MGS:TS interesting, and it's one of the most cinematic games out there so that part is a very strong element of the game. The Timesplitters games are also very good, but they are less about plot and more about unique challenges for the player to accomplish.
All in all, these are all great recommendations.