Fun for beginners. Simple controls. Classic deathmatch and great capture the flag. You can press down on D-pad to fake your death and then pop right up to surprise your opponents.
First COD game to slow player movement based on the primary and secondary weapon. For example, if you are holding a pistol, but have an LMG as secondary, you will run slower with the pistol than you would if you were not carrying the LMG.
The final game of the 2nd generation of COD. Only COD with multi-team core mode (Team Deathmatch/Kill Confirmed) and also first COD to significantly expand bots to more complex modes.
No reason to play the X360 version on modern consoles, since XB1 version runs better, with better graphics, and allows more players. No crossplay with Xbox One version.