Superman vs. The Elite (2012)
Dir. Michael Chang
A rather strange work in which a small group of new 'heroes' arrive in Metropolis and help cut down the Big Blue's workload, but their methods aren't sympathetic with his impossible ideals.
It's based on Joe Kelly's What's So Funny About Truth, Justice & the American Way? (2001) storyline. I've not read the source text, but after watching the film, I definitely want to, which is not my usual response to DC's adaptations.
It doesn't just use the medium as allegory, it includes real world concerns in a fictional setting. It initially distances the origins of the unfavourable actions from American soil so that it can use them as a critique of home, but by the end shrewd viewers will be in no doubt as to what the message is, while at the same time being left with a shaky moral platform from which to soapbox.