I declare myself to be a die-hard Tintin fan. I have been since early childhood. I've always had the entire series of books at hand and over the years must have read each of them literally hundreds of times. I could never get enough.
I've just come back from the Spieldberg/Jackson 3D offering based on "The Secret of the Unicorn".
I'm utterly blown away. As big a fan as I am, I am thoroughly delighted and satisfied - my expectations were far-exceeded. A masterpiece of animation/motion capture that absolutely nails it on the head. The characters, almost never what you've always imagined them to sound like, do - to me, anyway. The rendering is state of the art - there's been nothing better before it. Jackson and Weta are phenomenally talented people.
If you're a fan - go see it in 3D. Don't wait until it's on iTunes or DVD. By all means buy it then too, but see it on the big screen. It's marvellous.