I'm not a big fan of the first two Harry Potter movies, because... they were exact replicas. And the reason Harry Potter is so special is that everybody gets something personal out of it. The first two movies didn't have as much feeling. The two Deathly Hallows movies are some of my favorites. The first was all about the characters, and their relationships, and the movie was so honest and heartbreakingly true to that. The second was about sacrifice and love, and they did the same thing. All that matters to me, really, is that they're true to the characters they created.
The Harry Potter movie characters and the Harry Potter book characters aren't quite the same. That's why the movies are 'based on the novel' and not 'the movie of the novel'.
I understand that for some people, they'd rather have an exact copy of the book, but not me. I've already cried over the novel. I want something new to make my feel.