Watched this over the weekend and love it. Great story. Stunning visual effect. The only thing that does not stand out is the theme song... Worth an IMAX 3D experience. At the end of the movie we heard applause, indicating many others enjoyed it too.
If you decide to go, go early to pick a good seat. We went half an hour before the start time and there was already almost 100 people waiting in line...
I had high expectation after seeing the trailer and was one of the first to see it on Christmas day. But it turned out somewhat disappointed. The main line of the story is not sufficiently well designed. I would say it is not a good choice by itself at theaters unless you want another chance to see Downey, Law, or McAdams...