Tolkien's story was rich... full of a lot of texture. It can't all be done billbears! I am not so rigid as to not allow another fan (which Jackson is) to retell what he thinks the important parts are - his favorite parts. Any one of us might have different favorite parts of the same story. - I think so far the story has been told with great care.
The movies are a summary - a retelling of the story. Not meant to replace the book, but to illustrate the book and give another interpretation. If you look at it like that, perhaps you can be happier than if you expect a word-for-word duplicate of the book.
I see that, and I do understand Jackson's retelling. However, I can understand Bombadil going more than I can the Scouring. Bombadil might be an addition that can be written out, but the Scouring does much more than just add a character