This video is actually better than the real game. Also is this on PC? It looks a shitload better than the 10 mins I played of MW2 on 360. Lastly on an unrelated note I hate having only 1 grenade or like 2 reloads per spawn in any game.
The average player has a difficult time living long enough to empty their first clip, let alone run out of ammo. You can also get certain perks and just run around ninja style knifing people. The game is a billion times more enjoyable when you've mastered running behind someone for a couple seconds and then throwing a knife in their back (knowing they may watch the replay).