Lord Shplane
Anyway, BEST FUCKING FPS EVER. No, really. Hands down.
Haha. No dice.
A great first person shooter captivates the player and brings then into the surrounding, it gives you a purpose for fighting and makes you feel as if one is part of the combat, or part of the fight. A great shooter features the following: Great campaign and level design, a good array of weapons, smart AI, and enemy design.
Call of Duty 4 is far from the best first person shooter, as it is merely a multiplayer game with a single player tossed in. If you want a good first person shooter, go back and try some Doom, some Battlefield 1942, some Goldeneye, and the original Half-Life (...and to a lesser extent, Half Life 2, which had great level design but felt much too linear). All these games were challenging, fun, and were actually original for the time. Not to mention they have fantastic replay value.
(I'd say Duke Nukem 3D, being revolutionary in it's time and all, but the humor gets old and the level design much too dull. It's great nostalgica though...)
Call of Duty 4 is merely a rehash, only to be forgetten in the following months when the next pretty scripted shooter comes out, much like Crysis, or Halo 3, or any other shooter this year that everyone is proclaiming as the BEST EVER HURF DURF.
2007 sucked for shooters, the only interesting one was BioShock... and they even managed to fuck that up with some very stupid design choices.