I kind of feel like thats a tiny bit of a misrepresentation of Marvel. The stories were kind of progressive when they were written, its trivial stuff now 60 years later but it just kind of seems like they're an ill fit for the box your trying to shove them in. Like all 3 Captain America movies are about him rebelling against a corrupt and detached american government. The 2nd film had a villain with a shit russian accent but he was looking for revenge for the avengers basically killing his family as an obvious metaphor for the american government dropping bombs on civilians. The justice porn, vigilante angle fits much more than the Chritopher Reeve truth, justice and the american way shtick which just isn't used.I see comicbook movies more a continuation of the Cold War era films where the audience was always supposed to cheer for the virtuous Americans upholding liberty and virtue, and scowl at the evil foreigners, usually Russian or attempting an unremarkable Eastern European accent. Films like Rambo, etc.
Though I suppose Westerns were the precursor so you're not exactly wrong (i.e. the good guys vs. dem 'injuns!).
I think their closer to old school adventure movies personally. The kind Indiana Jones paid homage to. I dont think theres any real world meaning or relevance to be taken from the most recent thor movie beyond jeff goldblum is neat.