Ended up returning MW3. Campaign was mediocre, a couple of hours at best and didn't have an actual ending. MW4 will probably be the remainder of the story, another dlc charged at full game price.
Multiplayer is OK but just a bunch of old maps with a couple of new ones and poor matchmaking with lots of high latency issues (exclusive to mw3, no issues with other games).
The only good thing from this overpriced DLC is MWZ, which is absolutely fantastic and great fun.