HP5
Loved it. It's the best of the bunch.
Mind you I never read any of the books so I'm not bummed about things being cut out but even then I found that the previous installements took a lot of shortcuts, like if the filmakers thought absolutely everyone read the books.
I didn't get this feeling with #5. Lots of fun, good pacing, great acting and some very cool magic action scenes, especially towards the end.