It's an article of faith with Batman fans that he's the best at everything (Doc Savage in a cape). But, just speaking personally, I would like to see him played up more as a detective than a martial artist. He could still be very good, able to hold his own against most fighters... but most of his energy should be going into solving crimes by deduction and finding clues, rather than hand-to-hand. I'd see Batman as someone who prefers to maneuver his enemies into capture rather than slugging it out with them. And having him over his head against a top martial artist wouldn't diminish him, in my opinion, just make him a more workable character. But I'm usually in a minority.