I showed this to my cynical 16 yr old sister and she LIKED IT. Also the best in the trilogy and truly entertaining for the entire runtime!
I felt as though this film was trying very hard to be that stepping stone for people to understand mental illness...which, it may have been? It's like... a diet version of a real life scenario.
Listening to some interviews of the cast, they felt as though they were accomplishing a very noble and a higher goal. I think it felt kind of smug in that way. The special features took the whole thing down a notch for me.