I like games with hard questions in them. Games that can reach inside you, tear out your soul and make you reevaluate who you are.
I dont expect SCO to be that dramatic. But will the player have to answer hard questions? Question that are asked directly at the player and not the character. Questions that have no good or bad answers.
Is the players cause righteous enough?
Do you think of all the hopes and dream you extinguish every time you pull the trigger?
Is humanity worth saving?
Would humanity be better that the "evil empire"?
Also, will you keep statistic of what the player will answer?