Kyle Johnson’s review published on Letterboxd:
Finally, the flesh reflects the madness within.
The Prisoner of Azkaban is probably my favorite of the series for several reasons. The first reason being that this feels like the most positive growth for the trio, especially Harry. This is sprouted by the magic we know and love, and mixed with the angst of adolescence to give us more rational decision making. Because of this, the characters can put themselves into the plot, rather than things simply happening to them.
On top of this, each new character has more feeling, meaning, and importance to the series than the antagonists introduced before (with the exception of Voldemort, of course). That, and Sirius Black might be my favorite character in all of the Hogwarts universe.
The storyline is also better paced, equally mysterious, and more interesting than the rest, and notches in as one of the shortest films of the series (as long as you count Deathly Hallows as two separate films).
This one is the last novel that I actually read as a kid, so maybe that has to do with why I feel so familiar and fond of it. The rest of the series after this one is less memorable to me, so my mind could be changed. Let’s find out.