I really would have loved to like this more. And I tried to stay with it, as long as I could. You could argue about the 3-D or not. I will leave that aside and concentrate on the movie. A movie that starts off quite nicely. But as it progresses and with more riddles and things happening out of nowhere, you will loose focus of the movie and it's main characters after awhile.
And although it has a good idea as it's stronghold, it still is too long, for it's own good. It feels as if the running time, is twice as long, as it actually is. While not much is happening and you still loose the plot/focus of the story, it's hard to find many good things in this. I still liked the cinematography overall (not the 3-D effect mind you) and some story beats it took. But as many people here, I was expecting much more of this.