While I agree that Spec Ops missions shouldn't count as full pieces of DLC I don't think they're trash. I think most people who play multiplayer and zombies underestimate how many people enjoy not just survival mode but also the missions and the campaign.
Still though, look at the content they've added post-release:
12 multiplayer maps (playable in survival)
5 face off maps
8 missions
1 new mode
1 free multiplayer map
2 free face off maps
4 free game modes (infected, drop zone, face off, FFA gunplay)
That is quite a bit. On top of that they've stayed very much on top of cheaters, hackers, exploits, updates, buffs, nerfs, and generally good support. In my opinion IW/Sledgehammer/Activision have done quite a bit to show that they care about their customers. I think this rivals what Treyarch did last year on most fronts and edges ahead a bit in a couple places.
