I pretty much agree with every thing Andrew says. The Hobbit trilogy is unique in not only betraying the source material very thoroughly, but also in becoming a very poor film in the process. Three quarters of the deviations from the book are for the obvious purpose of making a trilogy out of what should have been a brisk, brief dualology, and it's made worse because Jackson obviously knows how to be both a good director and good steward of Tolkien's works but decided to abandon both for the all mighty dollar. American audiences have largely just lapped it up, though (although if you read their reviews, the English have been a bit more frustrated with Jackson's taking a dump on Tolkien's strongest, self-contained narrative).