The essay to end all essays.
Also for the ‘c-list’ part, can I point out that then so was Iron Man before 2008? Like to non comics readers (ie still the overwhelming majority of these movies’ audience) before the MCU started out the only superheroes worth knowing were most likely DC (Superman/Batman/Wonder Woman) and only second place some Marvel heroes who had gotten recent adaptations and/or were on kids’ merchanise everywhere (Spiderman, Hulk, the XMen - and maaaybe Cap).
So, this kind of ‘only famous bc of the movies’ hipster reasoning leaves me quite cold because…. so what? Should fans of a character feel ashamed that they only got to know that character because of a popular movie adaptation? Why? Come. On.