I think a lot had to do with the fact that I never got the opportunity to watch everything in the order as a kid. Half of the time I didn't even know witch part came before or after. Then as an adult when I watched in the order, I already knew what was coming next. It's one of those spoiled experiences - more to do with circumstances that anything else I guess.
I enjoyed the movies for sure but I won't call myself a fan.
As an example to compare: I am a fan of DBZ, Gundam or Harry Potter............for me fan means being a fanatic :-)