I don't know about campaign but all other modes support couch co-op while still being able to play online. (Multiplayer, zombies, and dead ops)
People may say they hate the series, but it does a great job of giving you plenty to do. You can be casual and just have fun, or you can get really into it and go for challenges, calling cards, streaks, or easter eggs.
But when it comes down to it; it's fun to play.
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Thanks. Yeah I'm just burning out from other games and just want something I can just into and have fun. The splitscreen is a big plus because there's not many decent games out there with it.