That's hard to say. In my experience (games I have played), I think Metroid Prime Trilogy is the best for a Single-Player campaign. For Multiplayer, it's hard to choose. The Conduit is a NON-WWII SHOOTER, but Medal of Honor: Heroes 2 seems to run smoother and faster (Conduit. I rented it and the single player SUCKED! Multiplayer was good, but sometimes it would glitch, like I wouldn't be able to find a server EVER, even right after it came out. Medal of Honor H2 I own and rocks, but don't play it as much)