I got it because a fiend of mine told me he plays a lot of it, I've not seen him online since I bought the game.
Played the main campaign, haven't touched zombie yet but will probably get to it at some point.
Its the first COD game I played since the Original first 2 games. I was kinda of disappointed with the main story, but then again BF3 and 4 never had the most engaging stories either so I really need to did my toe in to the multiplayer, I played one game it was fairly good probably a lot better with other people you know. Must try coop too.