This movie was well done. The major details were, for the most part, true to the book, and the production and acting were quite good. The story isn't quite as action-packed as movies/books 4, 5, and 7, but it was still entertaining and full of revelations.
My only quibbles are that: a) it focused too much on the romances between Ron and Hermione, Harry and Ginny, and b) the beginning seemed to receive more attention than the climax of the story, which seemed rather rushed.