Depends if that's going to be a big part in your game. If your going to make your game like Fable or w/e, then you should have it in.
Personally, I don't really care if I turn out evil or not. I usually just pick randomly and see where the ride takes me.
Well one thing I know about fable and fallout is that there is a LOT of stuff in them,
but story campaign is pretty short.
You find games like that fun, but behind all of that fun dialogue IS there something behind it?
(Not saying that I don't like them, I love fallout, considering I am getting Fallout New Vegas.)