I don't dedicate much time in to the online multiplayer when it comes to COD or MW games.....
So considering i will be playing mostly campaign and spec-ops then MW3 is a day 1 purchase.
After the MEDIOCRE campaign AND multiplayer of Bad Company (and how much would ALL the DLC have cost for Bad Company 2, around £50 wasn't it?)........ battlefield 3 for me won't even be a bargain bin purchase in 2 years from now.