Now, you don't have to count Deathly Hallows parts 1 and 2 as separate movies. I just prefer to, as I preferred one over the other. Mine are as follows:
1) The Deathly Hallows part 1- It's just perfect in every way. I just love the darkness and mysteriousness of it. <3 The tale of the three brothers gives me chills every time I watch it.
2) The Prisoner of Azkaban- This is one of the few movies that I actually think was done better than the book. I am always super intrigued when I watch the climax of the film, with Sirius, Lupin, Snape, and Peter Pettigrew. Also, the part when Harry looks for Peter Pettigrew on the map is one of the creepiest and most suspenseful parts of the movie and one of my favorite scenes, even though it wasn't in the book.
3) The Goblet of Fire- It's a little choppy and the book is SOOOO much better, but they really did a great job with the movie with what they had and stayed well within the time constraint.
4) The Half-Blood Prince- Again, choppy. The fight scene could have made the movie a million times better, but I was pleased overall with this one.
5) The Sorcerer's Stone- The one that started it all.
This one is great, and they are just SOOO FREAKING CUTE!!!!! <3 Especially seeing how they grew up from this one.
6) The Deathly Hallows part 2- It was great, but I actually didn't find it as good as part 1. Most people I say this to disagree with me though.
7) The Order of the Phoenix- Now this is the choppiest movie of them all. It's the shortest (if you don't count Deathly Hallows part 2). While I thought the climax scene was done amazingly, there were lots of parts that were left out from the book, like when they visited St. Mungo's Hospital, which I would have really liked to have seen.
8) The Chamber of Secrets- Now this is kind of my own fault, but I have seen this one WAAAAYY too many times. >.< Also, at times I think it's a bit boring. It's actually the longest one. Idk, I just don't like it as much as the other films.