What about Doom? Didn't that game give birth to the FPS genre in general.... Halo was beaten in that regard by more than 10 years. Or what about Wolfenstein? That game was the one that popularized the whole genre, and certainly a game that is regarded as a classic today. For those who think that Halo was "innovative", you apparently haven't played Quake. Halo and it's sequels copied many things straight off of that game. However, Halo did certainly set the standard for all FPS games on the console, if not on the PC, so I could see the original and maybe Halo 2 becoming a classic.