best JLA story was Rock of Ages, but I love Earth 2...
Owlman has intrigued me for such a long time...
He is the son of Thomas and Martha from a world where his brother bruce and his mother were gunned down by one of the corrupt cops in his father's force... Thomas Jr. went crazy for a while, and disapeared, probably to become a drunk. Then one day he figures out he wants to fight his father's justice, but he's too lazy, so he uses drugs and brain enhancers and steriods and all that stuff to become stronger and faster than the cops.
Then he took over the Gotham Underworld.
The best part of the Busiek arc was the hint at Robin. Owlman kills Jack Drake for not paying debt, and takes his son as debt.
Owlman owns a kid. Does that not terrify you?
Owlman is also just as smart as Batman... he just got to that point in the least respectable way.
The other heroes intrigue me too...
Ultraman was an ******* military dumb**** who became an astronaut and nearly died in an explosion. He was put back together by anti-kryptonians and Anti-Kryptonite is the thing that keeps him strong and alive.
I get the idea that Superwoman was an amazon who killed Clark Kent's wife and took her place. She is Lois Lane.
Johnny Quick created an opiate-like serum from the blood of the first Johnny Quick, from which he gets his speed powers.
Power Ring has an intelligent power ring that seems to be run by fear, possibly the anti-matter universe's parallax... Under the guise of a Monk.
...
The only real hero of the world is Lex Luthor, but there are others who try, like (my personal favorite) The Quizmaster, the smartest Man Alive (think: the good guy Riddler).