All the other Joker actors are better than Jack for me. He's my least favourite. Hated his Joker and the movie. Hated he was a known hood called Jack Napier, hated that he had a obsession thing for Vicki Vale, hated the Prince music, hated his dumb obsession with art, hated he was the one who killed Batman's parents. Never got the appeal to him. He's the laziest Joker performance too. Still looked and sounded like crazy Jack from his other OTT roles. Even physically he looked too rotund for Joker's slender physique.
Leto I am confident won't do this and will make his Joker so unique from anything he's done. Make it feel like a new character. So I am hoping he doesn't have the same quality as Jack, and I'd say most audiences are too.