I'm about 60% through the game by my estimation and so far I'm not that impressed with Caius. I appreciate that he is a different type of villain but so far he doesn't have much interaction with the characters and that gives him less of an impact on the story. I also feel that his motives are vague and misplaced. I'm sure I'll learn more by the end but so far it's just a lot of nonsense and when he shows up it feels more random than anything.