The other DrC and I viewed new release Divergent this afternoon. We had listened to the book on CD, last year while driving. The film is extraordinarily faithful to the book, more the exception than the rule in our experience.
Without littering the review with spoilers, let me say that the future Chicago in which the film is set is definitely dystopian. This isn't a film to see if you need uplift, sunshine, flowers, and happiness.
With that caveat, it is nevertheless enjoyable to watch. If Divergent succeeds at the box office, as it should, presumably films will be made of books II and III in author Veronica Roth's trilogy, books entitled Insurgent and Allegiant.