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Ghosts
World at War
Modern Warfare 2
Best ones campaign wise, the upcoming WW2 title looks promising as well.
The Black Ops titles along with World at War also have additional zombies modes which can be played solo. The games from Black Ops 2 onwards also have full bot support for sampling multiplayer 'offline' which can be enjoyed on your own.
The COD games are also on sale right now at Humble Bundle https://www.humblebundle.com/store/promo/activision-summer-sale/ although they are still pretty pricey.
https://youtu.be/Tn4bfT0fhfQ
From what I've played, most of them can be enjoyable. I'd recommend CoD4 and BO over the others, though.