I actually have a couple ideas for this.
You could have a city full of superhumans (I still don't know how your power would be chosen; I'd like it to be random but that may not be an option) battling for or against a corrupt government, the mob, ect. Besides your superhuman abilities, you could fully customize your charachter with clothes, equipment, ect. Think of it as "Marvel Meets The Sims."
Another idea I had is something where you have a bunch of fighting robots; the robots don't level up, so you have to modify them with different parts and "Gems", items that either give you new abilities or increase already existing ones; the max numer of Gems you could have is three, though, so there's no way to make someone invincible. A lot of it would be about strategy. I actually have a programmer friend who said he might be able to do this.
Apologies if your offended by my bright eyed optimism; if it makes you feel better, I'm quite cynical most of the time.