Originally Posted by smallville fan
Here's an idea. I'll leave plot and story for TPTB.
You could also do missions where the player has to possibly choose and triage big natural disasters and super-villain attacks etc and explore the consequences arise when you choose one thing over another. Think the light/dark side or other choice-driven decisions you would make in games like Star Wars: KOTOR or SWTOR.
If there's a will, there's a way.
I like the idea of it being much like the upcoming game Watchdogs. A living city in which everyone is unique and has their own story and lives. If you were to make a good Superman game, it would have to incorporate civilian attitude and feelings towards Superman.