Getting back to this!
Based on MOS, I reckon they could have a game with alternative endings.
Things you do or don't do impact the storyline and subsequently, the ending. A bit like in Spider-Man: Web of Shadows.
Will Superman emerge victorious or be seen screaming in defeat that he was forced to break necks once again?
It would give a sense of replay value and the feeling that what you do really does matter to the world around you. Determining who lives and who dies and how it effects everything. But also giving you the chance to be a full hero to rescue everybody and stop disasters and events that will impact the story.