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

This is a small, humorous movie in some ways, but it has a huge heart. What a nice experience.

It’s not bad or unwatchable but despite the amplitude of the spectacle, the end result is underwhelming.

The tone of this movie is interesting -- the stakes are both dramatic and high, but it's balanced with a lot of fun, tongue and cheek dialogue.