I haven't done single player so I do not know. In Multiplayer, you get to group up in squads of 4 players. You can then spawn on your teamates after you die, etc.
I would not say this game is better than MW2. It is different so both are pretty good depending on what you like.
apples to oranges in my opinion.. close quarters combat vs wiiiiiiiiiiiiide open spaces.. sorry
Looks like I'll have to go and find my joy stick. (I already hear your corny joke coming, sj)