I tend to stick to kind of a "75% light side" I just kind of go with the flow. Take Mass Effect for example. While I'm going to usually make Paragon choices, if the opportunity for being Renegade is going to significantly befit me versus a Paragon choice, I won't hesitate.
So Generally, I am good, because being evil never sits well with me, but I do be an asshole depending on the situation.