Have you gone back to play older Call of Duty games?

[Shortie]

Since the deal finally went through in the US between Activision and Microsoft, many gamers who enjoyed the old Call of Duty games have been able to go back to them and start playing again. 

Black Ops 1 and Ghosts are two that I know many have gone back to and started playing again and Black Ops 2 is another but Black Ops 2 does still seem to be heavily hacked at the moment making it difficult to play.

Have you gone back to any old Call of Duty games since the deal went through? If you have, which ones have you gone back to?