1. Half-Blood Prince - This is my favorite story as well. I love Dumbledore and Harry's exploration of Voldemort's past.
2. Prisoner of Azkaban - Professor Lupin is awesome and I like how they just say screw it, we're misusing time travel to fix everything.
3. Deathly Hallows Part II - I love the amount of action. The battle is very cool.
4. Chamber of Secrets - I like how Harry saves the day in this one. He figures out what's happening and beats a giant snake. Awesome!
5. Order of the Phoenix - I think this movie is very funny (only Half-Blood Prince is funnier) and Umbrage is just terrifying.
6. Philosopher's Stone - I like the introductions of the characters, but this story is just tame compared to the others.
7. Goblet of Fire - I like the Triwizard Tournament, but the immature feud between Ron and Harry is so annoying to me (realistic but hard for me to enjoy).
8. Deathly Hallows Part I - I can't watch the movie without wanting to murder Ron. In a sense that reflects good acting haha.