Death Hallows Part 2- Side by side with the beginning, everything comes full circle and we're shown an incredible climax where everything is on the line. It's a little low on my list because although it is the finale and well-made, it still feels lacking to me mostly in regards to character deaths off-screen and an overall feeling of finality. I'm sure the book probably has more closure to so many things but I had hoped to find more of it in the finale.
Order of the Phoenix- A majority of the reasons why the next films are at the bottom are a combination of poor direction and story and character development that doesnt compare to the balance of the other movies. With Phoenix, I was very excited to see the students create a new order and was filled with loathing for Umbridge, but it didn't possess the feeling of secluded rebelling teenagers against a fascist torturing teaching regime I expected. I'm still reading Secrets so I dont know what the tone is like in the book, but I'd expect something less whimsical. It also made Voldemort go from "I want to see the light leave your eyes!" to wearing a suit in the train station and making weird faces as he possesses Harry.
Prisoner of Azkaban- Despite everyone's praise for its direction and story and despite how many times I rewatch it, I just cannot bring myself to like Azkaban. I enjoy Lupin's and the Dementor's introduction very much, but I can't seem to enjoy much of anything else. The character's transition into teenagers feels very awkward and mismanaged (as teenagers should be I guess), but Draco goes from wishing Hermione gets murdered in Chamber (as a kid) to wiggling his fingers at Harry like a moron in Azkaban. Draco doesn't seem to revert back to his sadistic nature until HBP. Harry's revelation about Sirius felt rushed and the time turner sequence felt more like a tiring retread instead of a clever time-travel plot. Cuaron is still spot-on though.
Half-Blood Prince- By this point in the story I'm waiting for a war to break out at any moment, but instead the story focuses on the horcruxes and the relationship between Dumbledore and Harry. Apart from those two things, I cant recall any other element of HBP that I enjoy. A couple of these films feel like they exist solely to introduce one piece of a bigger puzzle that eventually comes together in the ending rather than a film that you can enjoy watching by itself even it is a chapter in a series. HBP is one of those films and, like Azkaban, I feel could be skipped if it wasnt for the introduction of some core characters and plot devices. Also, I have to turn up my brightness incredibly high to see anything in the movie.