By any chance do you have a BT router?
I had this problem and found out it was due to a issue with my bt homehub.
Btw no issues with MW3.
MW2 can take ages these days to get going in the lobby system - start a private game and leave it running 5 minutes and then quit back to lobby and it seems to kick it into action![]()
Maybe everyone has finally boycotted it![]()