Neverwinter Nights 2 has a great storyline whether you choose to be good or bad, same for playing anything in the Imperial faction on SWTOR, although even when I try to play a Sith, I still end up making all the light side choices because I'm rubbish at being mean. I tried to make an evil character in Fable once and failed at the first hurdle because I couldn't deal with making the wee girl cry, and had to give her her teddy back. All in all, it's a good thing there aren't too many games like that, or at least there are ones with a choice, or I wouldn't be able to play them!