Being a huge Tintin fan and having the same as an alias name (for obvious reasons) this movie was something which was not meant to be missed. Before I was caught on by the Harry Potter fever , was hooked big time to comics, with the jewel on the crown being Tintin and Asterix comics. Still remember the day in 6th grade when my friendly neighbourhood library started to stuff 2nd hand Tintin comics. Everyday I would be excited to pick up yet another book of the series paying 3 buck rental (against 1 buck for other books :P, demand & supply gap I presume :P) and when a "not so small" boy started to fantasize about some out of the world adventures (Destination Moon/Explorers on the Moon :) ). Still to this day I enjoy going through the entire collection I have in form of pdf documents, a return back straight to my childhood. Hence in short this movie was something more than any random movie that I was going to watch.
Now shifting focus to the actual movie. Frankly speaking I expected a lot more from this adaptation, and I presume it is the common consensus among Tintin fans. First and foremost the movie doesnt really captures the feel one gets while reading the comic strip. Even though the initial storyline was pretty faithful to the comic book, it was a tad too boring. Only from the 2nd quarter does the pace pick up. But on the other hand it has an awesome viewer experience with respect to motion capture technique adopted by Spielberg which brings life to the comic characters and an equally mesmerizing 3D content. So in short those who haven't read the comics before will enjoy the most as everything is completely new to them (my mom loved it :)), and it is not one of those movies like Harry Potter where you have to read the book before you see the movie to understand each and every angle. As expected Snowy (the dog) was at its comical best, to draw in more children/adult crowd alike.
The makers of the movie have tried to mash 3 books into one (Secrets of the Unicorn, Red Rackhams Treasure and Crab with the Golden claws), with a generous additions of their own to make the transitions seamless. This was done obviously since content of a single book (with just 62 pages of comic strip) was way below the content required to make a movie. So we can expect to get sequel movies for those comics which had continuity into another book (Destination Moon/Explorers on the Moon, Seven Crystal Balls/Prisoners of the Sun etc)
Overall I would rate the movie just above average at around 3.5/5, especially for its visual content than its storyline. But one undeniable fact is "Tintin literate" base is gonna swell and the comic sales is gonna soar because of this movie. A whole new generation is going to discover TINTIN :).