Virtually all FPS's have an auto aim feature that provides subtle but extremely important help for the player. This is when consoles were first designed, they weren't designed for FPS's. If you think you're pro, turn off the auto aim in the settings, and see how far you get.
All cred to Gameinformer magazine
Aim down sight.
it gives you quicker site aim.
aim down sights, read the book
call of duty 2
Depends on which game you're talking about. On Call of Duty: Modern Warfare 2 it makes you able to hold your breath longer while sniping, and in Call of Duty Black Ops you aim down your sights faster after running, and you recover faster from a knife lunge.
The latest call of duty out on playstation 2 is either Call of Duty Modern Warfare 2 or Call of Duty World at War
Just call of duty 2
2 Call of Duty titles have been released for the original Xbox. They are Call of Duty: Finest Hour and Call of Duty 2: Big Red One.8 Call of Duty titles have been released for the Xbox 360. They are Call of Duty Classic, Call of Duty 2, Call of Duty 3, Call of Duty 4: Modern Warfare, Call of Duty: World at War, Call of Duty: Modern Warfare 2, Call of Duty: Black Ops and Call of Duty: Modern Warfare 3.(This information is as of 18 September 2012)
call of duty finest hour call of duty 2 call of duty 3 call of duty world at war call of duty black ops call of duty 4 modern warfare call of duty modern warfare 2 call of duty modern warfare 3
Call of Duty 1. Call of Duty 2: Big Red One Call of Duty 3. Call of Duty 4: Modern Warfare Call of Duty 5: World at War Call of Duty 6: Modern warfare 2 Call of Duty 7: Black Ops Call of Duty 8: Modern warfare 3 Call of Duty 8: Black Ops 2
Call of Duty Call of Duty 2 Call of Duty: Finest Hour (sort of a console port) Call of Duty 2: Big Red One (sort of a console port) Call of Duty 3 Call of Duty 4: Modern Warfare Call of Duty 5: World At War Call of Duty Modern Warfare 2 Call of Duty Black Ops This does not include DS, Wii or PSP ports. I believe that makes 9.
There are no cheats like the ones in Grand Theft Auto for Call of Duty 2, though there are some glitches available. A good website to check for these glitches is cheatcc.