No but you can do splitscreen.
sadly no
you can check that on xbox live go to baracks, then leaderboards.
No
Yes!
Same
Yes
You cannot
You can play 2 players on Special Ops missions and you could also party up with your friends on Xbox Live.
In Xbox Live i say no but the campaign is cool
the best map for xbox live on the game modern warfare 2 is either favela or rust.
Modern Warfare 2 map pack the "Stimulus Package" is out on xbox live. and it costs 1200 MS Points in real money $15 and will be out for PSN on April 30th.
Yes on the PlayStation Network, but if you have an Xbox you must pay for Xbox Live.