I personally think the way that the book has been translated onto film was exceptionally excelent! Ooooh... Big words... Though I have read the books, enjoyed them, and would defend them against critique, I still think what they did was good. There was TOO much information given in the book that could not be transfered onto the film at the same moments, or events that would seem coherent to the reader, but to the viewer would seem something out of a Lynch movie. I love it how they mostly just filmed all of the relevant and important scenes and character developments and just sprinkled throughout the movie, all of the trivia that JRR Tolkier wrote in the books. Like the whole love scene. Its not in the book, true, but it is mentioned in the Appendices.
But in the end, this movie is what it is... A movie... Not intended for LOTR fans, but for the general public. Yes, it has stuff in it to delight the LOTR fans, but in the end its sole purpose is to tell the story to a public who can't be bothered in reading the book.