I enjoyed the second film a lot compared to the first. I thought Harry was excellent, he's really started to come across as a strong character and a leader. Hermione is also gaining the ability to be an interesting character, not just a know it all.
However, someone obviously told Ron about acting, and his continual mugging and turning slowly wide eyed was pretty irritating to me...but no worries.
I didn't like the early car scene, but at least it was done quite well. Nicely cements Harry and Ron's friendship.
I liked Dumbledore! I thought Harris gave him exactly that kind of surface veneer of quiet gentility, with an undercurrent of real brilliance that only comes through when needed.
Moaning Myrtle was funny. Espcially when she offers Harry the chance to share her toilet if he dies...
Lockhart was fun, although too obviously an idiot. The best line was the "Terribly sorry. Fell asleep. Have I missed anything?"
Oh, and call me a terrible emotional idiot, but when Hermione had been de-petrified and she ran back through the hall to Harry and there was a big hug...that was nice. I liked that. Espicially when she then turned to Ron, and they both kind of paused, and didn't hug the same.
PS: My money is on Hermione and Ron getting together at some point, before she realises (at age 16-18, whatever) that she should be with Harry. Kind of a Xander/Willow -> Xander/Anya and Willow/Tara kind of situation.