Do you think the movie can ever do justice to the book?
Of course. I think a movie can expand the experience of the book.
Take If I Stay. One of the amazing things about watching the movie come together was seeing the music scenes come to life. It is one thing to read about Mia's Juilliard audition or Adam's band. But to see it and hear it on screen elevates it to an entirely different level. Music is such a huge part of this story having a medium that allows you to see/hear/feel the music can pull you deeper into the book.