The last one I bought was MW 2, but i've played the multiplayer on all of them.
Favorite was World at War. Game doesn't get enough love.
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I [i]really[/i] loved WaW's SP.
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Yeah, single player and zombies were great, but I liked multiplayer the best. Having automatic subs, single shot assault rifles, and bolt-action snipers created a greatly balanced multiplayer, in my mind at least. It had some of my favorite COD maps, too. Castle and Dome were fantastic.