I've been a Tintin fan for almost 40 years myself and I went and watched the movie of course. I gave the 3D version a miss though, for me this sort of effect tends to take away from movies rather than add to them.
I found the character and face animation amazing with most of the characters. Snowy disappointed me a bit, as did the Thompson twins. Overall it was a great spectacle and I look forward to the sequel.
EDIT I found opening the movie with Hergé drawing Tintin's portrait a nice touch
Cheers
Steffen.