Rotten Tomatoes seemed to think the acting was uneven and the climax a let down.
American Mary is about class and gender struggle and about how the only true freedom is forging your own path, creating your own you, and defying the world's expectations as often as possible.
The only criticism I want to offer is that I wish there was MORE. Mary Mason's story was exciting and The Twisted Twins introduced many great characters that I'd loved to have seen more of. The only way the climax was a let down is that it came too soon.