He makes one type of superhero movie
Kind of a weird statement. Sure, he's made 3 superhero movies, but they were all a part of the exact same trilogy with the exact same superhero. Of course they're all going to be similar.
We really don't know yet what he is able to do with other superheroes.
I admit, though, that Nolan does seem to have a certain style, and The Prestige
is easily one of my least favorite movies ever. So far for me, Nolan has been hit or miss.