MR DEATH is one of my favourite types of documentary: those that tell a story you're completely unfamiliar with, but which turn out to be extremely compelling and indeed gripping thanks to the stuff being presented. In many ways, this is a simple story of one man's fame and later infamy, although director Morris uses it as a springboard to embrace some wider concepts, such as capital punishment and the Holocaust.
One of the important things that I took away from this was that Leuchter is no villain: just a misguided man who didn't necessarily deserve all the hatred aimed at him. Yes, he made a grievous mistake, but to destroy his life as a result of that error? "Let he who is without sin...", etc. The political side of the documentary is especially interesting as a result.