The Best Call of Duty Campaign

This is a little poll I put together out of curiosity. I thought it would be interesting to see what people think of the Call of Duty campaigns, so just by placing your vote on your favorite Call of Duty campaign, you will hereby participate in the opinion of the whole community and recieve free ice cream... Actually that last part is a lie, but it'd be nice, right?
By the way, I decided to do the Modern Warfare and Black Ops (excluding World at War) series as one each.