Re: Go home, Superman!
I've always thought that the best use of Batman in the JLA is as the information guy. He probably can't stand up to the uber-villains, but he's the one of the group who can help coordinate attacks, knows the villains main weaknesses, what tactics they are likey to use, and help the "super" heroes like Superman, GL, or Flash best use their abilties on the bad guy.
That being said, I have to agree with others that think Batman is WAY overpowered in the comics. Even though he has the Kryptonite ring Superman gave him, if Superman really turned evil, wouldn't he go and fry Batman with his heat vision first?
Ed
...at least that's what I'd do if I were an evil Superman.