That's completely fair. I don't want to dismiss them. But yeah, I guess I'm coming from a place of appreciating how much impact the characters were able to make via just one film appearance. With Bane in particular, because he was far from an A-list villain before TDKR. To me, that says something about the quality of the characterizations, performances and films they're in. Ledger's Joker gets talked about alongside Hannibal Lecter and Darth Vader regularly as one of the greatest screen villains of all time.
It doesn't take anything away from Thanos and Loki's popularity and them being great comic book movie villains. I thought what Brolin did with Thanos was fantastic. I just think it's almost an unfair fight, because Batman already has the most iconic villains in comics, and we've had some incredible actors give really specific, memorable performances as them. From what I've observed, it crosses over a bit more into the mainstream in terms of the pop culture staying power, quotability, etc. That's just my take though.