Is it really that hard to get the flying shyt right? Or are they worried it would be too much like flying in a plane the whole game?
Yes!
This is why they never tried re-doing another superman game, it's what developers themselves said
Unless they come out with a controller spefically designed for flying it will just be another flop
Even airplane games don't do so well.
Batman is a hero that because he has no powers and is always ground fighting he is an ideal choice for fighting games and plus the cape gives massive amounts of added fun to the game.