"1. In your opinion, what is the best translation of a book to a movie?
2. The worst?
3. Had you read the book before seeing the movie, and did that make a difference? (Personally, all other things being equal, I usually prefer whichever I was introduced to first.)"
I couldn't really come up with a "worst" rendition, but as far as a great movie version of a slightly sloggy book, I would have to go for The Wizard of Oz. It's one of those movies where the film version achieves such perfection that the existence of the book seems almost unnecessary.
I'm actually not sure if I read the book or saw the movie first, but it doesn't really matter -- all things are not equal in the two versions.