ok... here is the secret to getting your CPU to get all of the kills... my xbox has been running for 11 hours at this point, and i have gotten a good amount of exp (not as much as if i was doing it... but i was sleeping)
1: do the c4 thing
2: kill the first few guys
3: put your teammate RIGHT in front of the bomb (nearest the turret respawn)
4: position yourself on the backlaft (if you are face the bomb from the checkpoint) behind the little filing cabinet with the computer monitor on top.
5: tape down your left trigger. the end.
why this works: if you poisition yourself anywhere along the walls of the room, it triggers all of the other spawns
negative: your cpu only gets you 5xp per kill, and he does kill relatively slow
...but you are also out doing whatever you want and still getting free exp.
give thanks if you havent found this already
