A game that will suck you in and not let go. Extremely difficult at times but worth it for the multiplayer.
The multi-player is great. I've put in a lot of hours with friends just blasting away. You can choose any character that you've unlocked as well as weapons you've unlocked. Setting up bots and teams makes for a very diverse battlefield.
The extras are fun for a break and unlocks various multi-player functions like characters and maps. Some of the Arcade and challenge modes are a little much but just take practice to beat them.
The reply-ability of this game is awesome. First going through all the levels on each difficulty setting, then trying to beat all the arcade and challenge modes, and finally all the multi-player options makes this an excellent game.
I would highly recommend this one for FPS fans.