The SW is an intellegent warrior who deals with his problems through either brute force or through cunning, planning, or corruption as appropriate.
I personally preferred playing my warrior as less of a brute and more of an intellectual. He did kill those who betrayed or attacked him but he would hardly kill if they did not deserve it. Resources for the empire and his power base were more important then mindless slaughter.
I have to say I was terribly bored during the SI story. I never really felt like a true sith; only like a little kid running around with super powers zapping everyone.