I would say that Avatar is about the potential for good and evil. It exists in all people, in all actions, and in all cultures. So you have the Dai-Li and Hama and Jet... while the Fire Nation is mostly repressed, mostly good, and under leadership that makes the Oedipus cycle (Tyrannus, @ Colonnus and Antigone) look ideal.
I'd say Rose of Versailles is a good one as well. It's melodramatic and kitschy in places and unavailable in the US (I got the French DVDs and alternated from Japanese dialogue and French subs, since I have some understanding of both). But it's definitely worth seeking out if the most recent Marie Antoinette film struck you as too soft and evasive. It does assign more blame on the aristocracy but not to the point where they're dehumanized.