Due to the fact that there is that whole time travel thing going on, this movie is also overly long. However, the dementors are suitably scary and they did an excellent job with the hippogriff. It struck me, as I was watching Hermione explain everything to Harry, that this may be one of the few places in the Hollywood cannon when the female character saves the day and makes no excuses for her smarts and also is not punished by the shunning of the male characters, drug use or eating disorder.
poster from: http://www.impawards.com/2004/harry_potter_and_the_prisoner_of_azkaban_ver3.html
What a lovely point about Hermione. She always rocks. This is a fun one!