@Tony: Oh c'mon, Order of the Phoenix was the best of 'em by far.
Yep. It's not even close, IMO.
Ehhh idk Prisoner of Azkaban is still my favorite. The twist near the end with Sirius, Remus, and Peter is still one of my favorite moments on the series.
Agreed. Plus, Buckbeak's rescue from death coinciding and converging with Sirius' own escape, plus the novel's ending leaving you (and Harry) with some hope for the first time in his life that he had a family member who cared for him, was kind of a tear jerker tbh.
Order of the Phoenix was the worst for featuring a whiny brat main character, and then dashing all of the aforementioned hope re: Sirius.
And wtf would you expect for a guy who just witnessed murder for the first time [and processed it], was being hunted down, and no one believed him for a while anyway? And that's without puberty.
Also getting into Snape's mind was very very important.
And I'm sorry, but the ending in London is easily one of the best endings.