While the movie touched on most of the important parts of The Half Blood Prince, I feel as though they left out and/or changed other parts that were just as important, not only for the future storyline, but for the character development as well.
Because it is Harry and I love all of the characters, I enjoyed the movie for the entertainment value, but I was sadly disappointed by what was cut, without even a reference to any of it. It seems as though we are only getting part of the dynamics that make these characters so endearing to all Potter Fans.