It's a well known problem and has been happening since the start of cod:waw.
If you want to get practice for MW2 play cod4 - my friend is a beta tester on the 360 and says its practically the same just updated.
Has he tried out the multi-player yet? Be interesting to hear what the levels and Weapons are like. Hope it doesnt turn out like cod4 with the ak74u, ak47 and bolt action sniper rifles the only usable weapons.