I can't say disappointed. But I have felt that it is too distracted. For example consider "the shining" novel written by Stephen king . It was interesting to me. When Stanley cubrick announced that he is going to make a film out of the shining , Stephen king was excited and happy. But the next week Stanley cubrick said to the media that writing by Stephen king was very weak. He didn't take Stephen king in screenplay too.. he joined with another writer.
What I understood is, film is a visual medium and we can't show all the character description and characters internal world in sentences like in a novel. There have been new scenes added in many adopted films to just show the characterization of the particular character. Some films ignore some facts because it cannot be shown visually.. finally end up with a film that is vastly deviated from the original novel.