When seeing a movie based on a book, it helps to look at the two as seperate works. Despite teh fact there were several changes from the novel, the movie is the best to date. As some have said, the movie does drag on at parts (namely dealing with the romantic development of the characters) but even when it does, contributions such as comedic relief are added to the film. For those who read the book, the end will be somewhat more abrupt than you would like, but that only beilds anticipation for Deathly Hallows part I.