Also saw it in 2D- can't see the point of 3D and hate wearing the glasses. I thought it was very faithful to the book, and the lead actors were excellent, good photography etc, I'm just not sure it actually added up to but it didn't really add up to very much (maybe because I had read the book and knew the ending). However I did read the book years ago, and although I enjoyed it at the time, I'm not sure it would stand up to a second read.
1. Just re-read the end of the novel and now see the film explains the metaphor for the hard of thinking. Cop-out.
2. Now find out that Martell was "inspired" to write his novel after reading Scliar's "Max and the Cats", where a German-Jewish refugee sails across the Atlantic with a jaguar in his boat. This man was given a sentence of acknowledgement in the author's introduction. After Scliar had fronted him about, er... lifting his central conceit.