You're paying $80 for the multiplayer. I haven't played a campaign since MW2. Have bought 4 or 5 CoDs in that time.Dunno if I could recommend this game or not, having just finished the campaign on PC. I am not a huge gamer, and not at all into multiplayer, so take this for what it is worth.
There were parts that were unreal, like the house raid early in the game, but overall it is short and just feels very lacking in depth. Took me a week to play through it, only playing for an hour or so a day. The gameplay, graphics, and the acting in the cut scenes is as good as I have ever seen.
It just feels like when you have something nice to eat, but you are still hungry afterwards. If parting with $80 isn't a massive deal to you, then I would recommend it for single players.