batman was always the most realistic superhero, all nolan did was cut out the most unrealistic parts, such as killer croc and man bat, and choose the most realistic villains, such as ra's al ghul, joker and bane
still, not too realistic, i mean those cuts to the joker's mouth cut several major arteries, plus dent getting half his face blown off would have killed him, and bane getting his face ripped off is also a dangerous thing, and a mask holding in the pain is so technologically advanced, it's just not funny anymore. the batmobile, the batpod, and the "bat" probably wouldn't work, but most of batman's suit is based off real things
the material used for his cape, however, in real life, is more attributed to cars, and would be impossible to make into a cape that could make you fly.