So, I'm stepping in as an expert of "People who had heard some Marvel stuff before any movie came out but didn't ever see comics or know that stuff." I think you are off on Iron Man. TOTALLY agree it was not the most popular Marvel character (my expert analysis, he's behind X-Men, Spiderman, Hulk, Thor, and probably F4 at least before even the fist X-Men movie), but I had heard of him. I knew almost nothing about him, but I knew the name. The guys you had talked about I know nothing on.
BUT, I think your Guardians analogy is SPOT on. I don't think anyone outside of die hard comic book fans had a CLUE about those people other than Chris Pratt and Batista were in it.
Exactly. That is the difference. Outside of Comic book world. Iron Man was def in the top five to ten zeitgeist of pop culture itself.