In that sense, within the scope of the Batman mythos shall we call it? Nolan's "Batman Begins" is hyper realistic compared to everything that came before it. The Dark Knight slipped a little. And The Dark Knight Rises went back into your typical derivative action film.
I don't think whether a film is derivative depends on its realism. Thematically, the story has always been about personal will. In that sense, his training to be Batman in the first movie and his overcoming his physical ailments in the last movie represent a clean, consistent literary theme. If you miss the theme for the details while already accepting plenty of fantastical details, you miss the point of the films. And I'm using films plural. If you're focusing on his knee, you aren't understanding the entire trilogy.