I want to buy a game for Ps2, but i dont know which one to get?

My boyfriend is a FPS (first-person shooter) fan, and he made some recommendations. He loves the Medal of Honor series, especially MoH:Frontline and MoH:Rising Sun. He also likes the Call of Duty franchise. If you don't mind more of a 3rd person action horror shooter, get Resident Evil 4. Great guns, lots of action, a great game all around! God of War is more of a hack-n-slash action game, but it's definitely fun. Both the original God of War and it's sequel are worth checking out.