A very simple film with most of the scenes confined to a conference room, participated by dull men in uniform discussing technical details. Doesn't sound as interesting as an average Hollywood action film, and still far from a graphic accusation of evil. But the great irony is so manifest for any watcher with minimum historical knowledge.
At least three ironies should be honored. First, Heydrich (the biggest boss at the conference) speaks with such opimism and confidence, and with so much light projected at his face, one can mistake him for a hope for humanity without the help of subtitles and a German ear. He looks like a good superior willing to listen to his subordinates, a bright mind caring about the future of his nation, and a dutiful man following "good" orders.
Second, the greatest conflict in conference was between Heydrich and Dr. Stuckart (medium-high state government official and drafter of Nuremberg laws discriminating Jews): Stuckart objected sending half-Jews to concentration camps, not because he was empathetic to the "inferior race" but because it would cause chaos in administration among the "good" Aryans; and Heydrich condescendingly "conceded" to this "lenient" policy.
Third, when Kritzinger raised the question of the psychological consequence of turning "good" Aryans into bloody executioners, Heydrich ordered Eichmann to explain how Zyklon B and concentration camp is a "humane" way to get the job done without hurting the moral quality of the soldiers.
A perfect film for those interested in Nazi history, in how evil can be perpetrated in such a twisted way that it doesn't seem evil in the first place, and in the application of dark irony. I would play this film in high school and university history courses.