A movie can NEVER be exactly like a book. They are two completely different medias. In my opinion, books are more powerful than movies because so much is left up to your imagination, and our imaginations can create things in our minds that a movie could never do justice... Our imaginations are far more fantastical. Also, a book can easily cover vast periods of time seamlessly, while a movie can struggle to cover large periods of time, so often times things just have to be cut out. I am not sure why Jackson chose to not include the scourge of the Shire. It would have been neat to see. But all said and done, I think that if Tolkien were alive today, he would have approved of Jackson's work.