If you haven't read 'Angels and Demons', don't sweat it. While Brown does well at telling a story, 'The DaVinci Code' for now will be his Magnum Opus.
I felt blessed after watching the movie of 'Angels and Demons' that Ron Howard made some of the changes he did to the storyline to separate his movie from Dan Brown's story. There are just too many implausibilities to the book and the movie eliminates that nonsense.
For almost 2-1/2 hours, the story does push through hurriedly culminating in the 'happy ending' we seek out of these tales.
Bottom line? Not Oscar worthy, not Prime time worthy, but something worth catching at a 'Budget Cinema' or '2nd Run'. And with Howard's editing of the story, it's worthy and believable.