Nightcrawler doesn't have superhuman speed, he has enhanced speed. Read the new Official Marvel Handbook on the X-Men. And yes rotting organic tissue does smell worse. Threw up the first time I smelled it in biology.
What I been trying to argue is that Nightcrawler literally announces his presence. No way would Nightcrawler be able to catch Bruce by surprise. Yes, Nightcrawler is stronger. But Bruce's costume is literally an armor. Batman goes up against global threats. His costume is not made of spandex. Its made of the best armor, a billionaire can buy. Batman even has alien (Martian, Kryptonian, Akoloptian) technology in his costume. Nightcrawler would get several hits in, but eventually Batman would have his number and take him out with a well-placed blow to his solar plexus or something.