I'll tell you why so serious

This is one of the few movies I've ever seen where the whole audience broke into spontaneous, loud applause a third of the way in.

The acting is good, and the firecracker script has some excellent ideas.

There are moments in this movie where the great movie it could've been peek out... They're fleeting, here, but they're worth savoring, and they happen often enough to make it worth your while.