First off, I have not ever read any of the Tintin comics, so I'm not writing this review from the perspective of someone who is comparing the film to the books. Therefore, if there were any inconsistencies in the movie, I didn't catch them - fans, feel free to inform me of any. I'm more than willing to learn.
Unless the movie was way off from the books, I imagine that even if I had been versed in Tintin's adventures prior to going, I would have enjoyed it as much as I did. I would have loved this movie when I was little. It would have even beaten out Indiana Jones (which was my ultimate favorite adventure series when I was little) by quite a lot, if only because Tintin is a far more likable character than Indy, and Harrison Ford didn't play him.
The computer animation in this was just astounding. I am not one who is very impressed with CG and the like - yes, it is nice when CGI looks real, but I really don't give much thought either way (unless it is just horrible). However, this is one time where I would actually say the movie was worth seeing just for the animation. The people are eerily realistic looking, and there were several times where I had to do a double-take when the camera panned over the "extras," to make sure they weren't real. It was amazing, and added to the overall appeal of the movie.
While a kids' movie, I think most ages would enjoy it. The storyline isn't very surprising - the mystery and clues easy to put together, but it's entertaining nonetheless, and there are many instances where the dialogue is actually very funny. Here was a time where the comic-relief character (Captain Haddock) truly managed to be amusing and not just irritating. It being geared more towards kids, there are, of course, a few chaotic scenes that got a little wearing, but they don't last super long, and they are very few.
All in all, I thought The Adventures of Tintin was a very fun, quite amusing, and very well-done film (the acting, even though you could not see the actors themselves, was brilliant), and they planned for a sequel intelligently, ending it to where if, for some reason, they decide not to make a second, it doesn't ruin the ending of the first. For the truth is no adventure can just end where everything is wrapped up in the end. There has to be something more, even if the Reader (or, in this case, Viewer) doesn't get to see it for themselves. Seeing this movie made me feel like a kid again, and I can safely say that even now, at my age, it's my favorite adventure movie. Indiana Jones just lost its honorary place among my adventure collection.