So, uh, this might sound weird but....Black Ops 2 single-player mode is actually pretty damn fun.
The "Cold War-era" missions are still your usual CoD fare, but with some added twists like playing near an entire mission on horseback close to the beginning.
I'm having a lot of fun with the "future setting" missions, though. The soundtrack is electronic and space-y like something you'd hear in a game like Deus Ex HR (though not AS good), and you get some neat abilities...like cloaking, that give it an almost Ghost Recon-type feel. The only thing reminding me it's CoD is the actual gunplay, which is good like always.
The multiplayer seems to have changed the least, but that new "pick 10" system is pretty damn cool. There are a ton of new ways to build your class to actually suit your play style this time around.
It's been a long time since I've actually enjoyed a CoD single-player, so I'm sort of impressed.