Editor's note: Tom Charity is a freelance movie critic for CNN Digital.

When Werner Herzog calls your documentary surreal, you know you’re on to something.

But Herzog doesn’t stop there: Of Joshua Oppenheimer's "The Act of Killing," Herzog marvels, “I have not seen a film as powerful, surreal and frightening in at least a decade.” The film is, he declares, “unprecedented in the history of cinema.”

And Herzog is not alone. The master American non-fiction filmmaker Errol Morris calls it “Amazing… unlike anything else I have seen." Like Herzog, Morris signed on as an executive producer to help director Oppenheimer get it out into the world.

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