Before this current round of capeshit came in with Iron-Man it looked kinda like this:>A-list (major world-wide names/big-time merch sellers):
Supes, Bats, Spider-Man, and possibly the Hulk>B-list (major players with their own comic-titles/cartoons known mostly only to comic fans):
Iron-Man, Thor, Captain America, Wonder Woman, Catwoman, Daredevil, Flash, possbily Green Lantern, F4, Wolverine>C-list (minor supporting characters, known only to comic fans):
Rest of the team-up mutiescum, Supergirl, Power-Girl, Dr. Strange, Ant-Man (any version), Black Widow, Hawkeye, Captain Marvel (any), Shazam, Batgirl, Nick Fury/SHIELD, Scarlet Witch, Quicksilver, Johnny Constantine, Black Panther, Blade, Cyborg, Green Arrow, Deadpool, Iron Fist, Luke Cage, Vision, Namor, Aquachad>D-list (very minor characters in niche comics):
GOTG, Nova, Plastic Man, Dr. Fate, Squirrel Girl, Runaways, Hellboy, Ghost Rider, Jessica Jones, Mockingbird, Huntress, minor mutiscum, Inhumans
Now Iron-Man, Thor and Cap are A-list and the rest of the Avengers are up on the B level. This is why a good successful TV show or movie is important - if not so much increased comic sales, but name recognition and thus merchandising. WW would probably be C-list if it wasn't for the old Linda Carter TV series - Hulk would be B-list if not for it's show. The imagery gets out there and the names become known. It's the problem with the DCEU at present - the suckiness of the films isn't raising anyone's name.