I watched the movie and it's far from disappointing. It's very thought provoking(Like the book), original(Like the book), and is very suspenseful and fast paced with an intelligent concept.
I think those who complain about it either, A) Have short attention spans, B) Want to hop on the bashing bandwagon, or C) A combination of both A and B in my opinion.
As I watched the movie I was completely drawn in by the film. None of it was dull, boring, stupid, or left me rolling my eyes or looking at my watch. In the end I accepted it as an intellectual entertaining movie and I wish others could do the same.
Tom Hanks, Ian McKellen, and Paul Bettany put on brilliant performances. Molina was misused once again(ala Spider-Man 2), Jean Reno could've been used more, and Audrey was alright, but I could've casted some one else for the role she was chosen for.
Tom Hanks portrayed Langdon as I seen him from reading Angels and Demons and The Da Vinci Code. Believe it or not, Langdon is a bland personality and unique at the same time. What didn't change in this movie was him using his intelligence and expertise in symbology and codes.
Hanks, as far as I'm concerned, is Langdon and I couldn't and can't picture anyone else playing him as he did.
Bettany was just downright scary. Words can't express how I got the impression to say a good 500 feet away from him.