you do know that the joker is not some moron right? he has done the following
taken over half the world using a toxin he himself invented with very very little prep time, he infected a few new gods, and circe, as well as solomon grundy, doomsday, and lex luthor himself, amount other people
when lex has the philosophy stoned and tried to figure out how to use it for months he still could not but the joker did in moments
joker almost caused superman to commit murder
joker made kryptonite using a kids chemestry set
one got some joker venom not the super kind but still a form of it into Wonder Woman
has been a step ahead of batman nermerous times, as well as the JLA, now if you wanna say Joker is some small time thug then thats nto a good excuse does that make batman a small time hero just cause he patrolls gotham or was he not picked as a JLA member, thus he is a world class hero and anyone who gives him trouble must be a world class interlect
ra's al ghoul needed the jokers help and the joker beat him in a game of chess
joker punked hush who took over all the gotham underworld
joker has punked lex PLENTY OF TIMESSSS
joker outsmarted mr myx and thus became ruler of the cosmos for a time
joker's madness is so great that guys even as powerful as the spectre himself cannot handle it
as emperor joker he punked the spectre placing him in a place that would cause universal damage if he tried to escape