Quote Originally Posted by Anteros View Post
I don't think Bats would have a problem with any legitimate hero bringing in Joker. He'd only stop someone like Punisher.

To be fair to Joker, he has taken down the Justice League several times, along with other Supers. He's no slouch, he's just not much in a straight fight.
Joker's combat ability varies from continuity to continuity and even comic to comic. Sometimes he's pathetically weak and only functions as a mastermind. Sometimes he's a pretty decent fighter who uses a lot of tricks to get on top. Sometimes his fighting style is so random and unpredictable that he can even take on Batman through confusion fighting.