Caesar's Romero Joker was the prankster, Nicholson's was the crime boss, Ledger was the mastermind anarchist, Leto was the idiot gangsta, and Phoenix was the mentally ill.
These are all fine interpretations of the Joker that express one or another part of the character (except for Leto, he sucked) but we've yet to see the clown prince of crime, the one we've typically seen in most main continuity comics during the last 45 years, the one we saw in the animated series, the one we saw in the Arkham games. The Mark Hamill, Troy Baker-esque Joker.
I wanna see that Joker on the big screen.