The original Modern Warfare one wasn't bad. MW2 sucked balls and Black Ops is a bit better but now where near as good as the rest.
I really didn't like the BO campaign, so I don't think a LP would really work. Also the fact that just about anyone interested in the campaign would have already played and beaten it at this point would make it pretty boring. Cod campaigns are really built on turns in the story, and knowing all the turns it would be hard to make it fun to watch. As for multiplayer, there are so many people doing it already, and there isn't really much to be said that hasn't been said. The two basic strategies for Cod videos are informative and random. Informative is based of providing tips and strategies for gameplay, but this far into the games existence pretty much everything is already out there, and your success in the game is just figuring out which strategies suit your abilities the best. In terms of randomness, you already get that with Stalin's other videos so meh
Black Ops let's plays have been done to death, somebody stabbed blew its head off and threw it into a pit of lava.