I read the book on an airplane recently. I think this is one of the rare occasions when the movie is probably better than the book; it wasn't bad, not at all, and there were a few small things that the movie left out or skimmed over for obvious and practical reasons...but the writing is a little on the rough side, a little heavy on the exposition. It made me want to go into beta-mode, because the potential was there but the writing was clunky as hell, at least in the first third of the book or so. Once it got into the whole fight or die territory, it was on studier ground. But the great thing about movie adaptions is that they add polish. The telling, not showing, is an easy vice to fall into in writing, but a lot harder to do in a visual medium like the movies.