The movie made a terrible mistake in changing the ending (the Death)..... There is no DA Death Eater showdown to create a distraction for Draco in which was the point of Draco getting Death Eaters in, in the first place. Thus the main plot line = zilch (Vanishing cabinet to sneak in Death Eaters) no character growth shown outside the four characters (Harry, Hermione, Ginny, Ron) TONS of cheasy acting by Daniel Radcliff (a.k.a. Harry Potter)....
Alas this is no tale but a double love story recorded in a diary by 4 best friends that just so happen to go to a magic school that ignores the larger world in general. Go read the book and forget this movie, go watch a good chick flick.