No actually. He's actually well done. He secretly opposes the emperor because while he himself is an evil douche even he realizes that the emperor is too fucking disturbed. If you choose moral comments he gets annoyed. He's the Token Evil Teammate
saw a vision of the player knight defeating lord vitiate so he pretended to be loyal to take the SOB down. He's on your side but he's not a good guy. He simply feels that Vitiate is going too far. at the end of day's he is still a sith