I haven't seen this as yet ~ I'm a Tintin fanboy and I read that three of the books have been combined to make this (i.e. The Crab With The Golden Claws, The Secret of the Unicorn and Red Rackham's Treasure) while a minor character in the Unicorn book has now been made the villain.
I would really like to see it but I don't know if I should or not.
Yes, yes you should.
The story of the Tintin movie is almost entirely the story of "The Secret of the Unicorn." The comic story comes to fruition in "Red Rackham's Treasure." The movie jettisons that. "The Crab With the Golden Claws" is only mentioned because it sets up a later part of the movie in an unnamed Middle-East country.
Sadly, there is no Cuthbert Calculus.
However, the Tintin movie is so good, and it so very true to the original comics. I was worried that they would play down the character of Captain Haddock, who is an unrepentant old drunk, but they don't. If you are a Tintin fanboy, you should see this movie. In fact, if you know the Tintin comics, you will be rewarded in ways those who aren't familiar with the comics in many unexpected ways.
The movie is a love affair to Herge's original comics, and also the best action movie I've seen this year. If you like Tintin, you need to see this movie.