It's entirely possible that sending the audience out feeling lousy was intentional

Unshakable, witty and deeply felt, the film will be paying emotional dividends for a long, long time.

It's the kind of movie you'll want to see a second time with someone who hasn't seen it yet, to remember what it was like to watch it for the first time.

Watching it is like watching the spectacle of a class clown at their best: you laugh at their jokes, instigate their defiance, and "ooooh" when they get in trouble.