I am sorry for all the readers, but I dont know where to begin.
Let me say at first that Im not a big Dan Brown fan, but I read Angels & Demons with great pleasure. The book deals a lot with the eternal question of Science vs. Religion and that made me think a lot about that subject again. That big battle is totally lost in the movie.
A lot of the important lines in the book (CERN, Maximilian Kohler, the scepsis of the Swiss Guard, the love relationship between Robert and Vittoria, the Hassassin, the relationship between the Camerlengo and the Pope) are lost in the movie screenplay. This makes the movie a very cut-down and over-simplified version.
Would the movie be any good if I hadnt read the book? I still doubt it. From scene 3 on, the movie is a chase-movie without interruption. There is no time for contemplation or depth. No story-line, no backgrounds. Its just a chase movie in a GREAT decorum.
You would think that with a running time of about 140 minutes a movie is able to bring more. Much more.