Doc is believable. Batman, not so much.
Doc was always written with the idea that he was a fantastic man doing fantastic
things, but only just - so as not to suspend belief.
Batman is a super-human pretending to be human. He is constantly getting smashed
into walls and bouncing back - just ridiculous. And let's face it, Doc was a
total humanitarian, but I guarantee that the Joker would have only appeared in
one story and then off to college. Batman is a laughable attempt at regulating
crime...