Now that you mentioned steel, I got into thinking: all objects must be destructible somehow. It cannot be just a particular slab of steel. He's Superman. A 4-foot pile of sandbags won't stop him. A building wouldn't, either.
Imagine a scene where he's battling a superpowered dude. Punches Supes. And Supes smashes through a building. People inside staring inside as he stands up to rejoin the fight. That'll be awesome.
Goes to show we really haven't yet reached the pinnacle of game technology (if ever).







