I finished the campaign last night and there was a lot I didn't like about it. The fact that they reused a lot of set pieces from previous games, Call of Duty 4 in particular, the fact that it largely felt like an extended epilogue to MW2 rather than an entirely new thing, the weird logical inconsistencies (such as the Russian president launching an all out invasion against the US, and then literally like a day or two later wants to be friends with them), and there are others as well, but... nevertheless... I really enjoyed it.
Despite borrowing a lot from the last two MW games there were still many cool, original moments in there as well. The sandstorm mission I thought was especially great. And as basic and one-dimensional as he is, for reasons that elude me I really like Captain Price as a character, and it was great to see him get some closure on everything that had happened across those three games.
There's something else I want to point out that I thought was great, and something I haven't seen anyone praise about the game, is that despite how crazy and over the top and bombastic these games have become, the developers showed a surprising amount of restraint in terms of level design. For example, I think it was in the Paris mission you go underground and move through the sewer system, and you take a shortcut through some kind of crypt. There are like skulls and bones on the walls and ****. It was a pretty cool place. What I'm getting at is that many other developers might have felt like turning that into an entire level, or at least some kind of extended sequence, but no, in this game it's just a neat room you pass through real quick. Similarly, in the New York mission, there's a part where you go through the New York Stock Exchange and it's got totally unique assets that you never see anywhere else in the game, and it's kind of a really cool area, but where they could have made an entire mission out of that, instead you're in and out in thirty seconds. There are several other examples of that as well. I know it's a weird thing to latch onto, but it was just something that stood out to me and I appreciated it.
I've only put a few hours into the multiplayer, but so far, thankfully, it seems to be leagues better than MW2.