Stein lets the Darwinists expose themselves and their biases with their own words. Something to watch for: all of the "religious fundamentalists" in the movie (proponents of ID) talk about scientific discoveries, while the Darwinists (supposed pragmatic scientists) all talk about religion. Ben Stein fleshes out Darwin's philosophy and takes the movie where it needs to go. The only minor drawback is that he doesn't explicitly connect the dots to Marxism, but it's not necessary to make the point.