I read half this book before going to the movie. Just from the first half, I was amazed at how different the two versions were, and I was glad the second half was nothing like the film.
For the YA genre, I give this four stars. I thought the prose was a little sub-par, even for YA, but I felt the story made up for it. I hope the writing improves over the course of the series, and the characters develop/mature. If they remain naive kids, even after their experiences...well, I guess all I can do is say bad things about it.