There aren’t many iconic superhero villains, period.
After The Joker, The Riddler and Lex Luthor, you’d be hard-pressed to get a layman — not someone steeped in comic book mythology — to name any superhero villains at all.
So, in today’s world, a good superhero villain is one who can enter the pop culture lexicon without having already been there.
Bane is the only villain to have done that. Everyone knows who Bane is.