As a player that as only played CIV V, I would agree with your sentiment. Its hard for me to want to go back and experience the others games as a result. I hear people complaining about things in CIV V that I absolutely enjoy, then reiterate about how CIV,2,3,4...did it this way, which is better. For me a flinch when these comments hit, because they create an illustration in my mind of games that are opposite of CIV V in the ways I like CIV V, which may mean that I wouldn't have an inherently pleasurable experience in those other games because of them.
Neb