Why can't I say all? Compared to its competing FPS shooter, Halo, it has too many things that make you want to throw away your controller and question the unlikeliness of a Modern Warfare Beta that would have fixed all this early. Unless IW planned this of course. Several perks are just made to go together.
Shooter/Sniper/Akimbo
Sleight of Hand
Stopping Power
Steady Aim
Knifer
Marathon
Lightweight
Commando
Silenced
Scavenger
Cold-Blooded
Ninja
Asshole/Noob-tuber
One Man Army
Danger Close
Last Stand
Coincidence?
Shooter/Sniper/Akimbo
Sleight of Hand
Stopping Power
Steady Aim
Knifer
Marathon
Lightweight
Commando
Silenced
Scavenger
Cold-Blooded
Ninja
Asshole/Noob-tuber
One Man Army
Danger Close
Last Stand
Coincidence?