In all the talk of graphical downgrades no one seems much preoccupied with 'why?'. Why build something and then proceed to tear it down, piece by piece, in the hope that ever more diminished expectations about the final product won't be severe enough to...
Gameplay: Great AI, You can customize them and you have a few modes to play on as well as some cool weapons. And doing a pelvic thrust with "Fat Boy" on is hillarious.
Controls: You can make your own controls so whats the point!
Graphics/Sound: Great job, the textures and polys are done well. The splatering of a decapitated head and the blood is done well. All the weapons sound great. Music is great. But some characters look blocky.
Multiplayer: Why people bought the game, a 16 player deathmatch between pros and even a CTF match can be as exciting as the Superbowl.
Replayability: The incredible Multiplayer can keep you coming back over and over again.