Well I just have to bring this up (I know this has been discussed before). In my opinion I personally think that Tolkien would have gone crazy over the entire "Faramir taking Frodo and Sam to Osgilith" scene. It is just that I thought (as many others did also) this part went terribily against the spirit of the book, the characters (it very much made Faramir for me much less of an honorable person, because he did something I would never, ever expect the book Faramir ever to do), and it had some terrible lines to boot!
I also believe that Tolkien would have disliked the length of many of the battle scenes just because they took away from the language, and the actual communication of the characters in the book. In addition the battles also allowed the addition of much of the modern language in the films (quotes in posts above).
But Jackson did a wonderful job, and probably the best of jobs expected
