Ha, yeah, I was waiting for the entirety of the original campaign for him to do the betrayal cliché and was actually surprised when he didn't. In Elsewyr the writers IMO nicely combined his arrogant smugness with a real desire to do good for the Empire. Felt like the duality deepened the char.
Yeah, he is an oddly polarizing one: quite many have felt him a good, functional, and deep character, and quite many (including me) have not found that side in him. But better a polarizing character than something everyone would have a consensus of, I think.
(I also thought, when doing the selecting on who should die, that Lyris and the Prophet might be more likely to get screen time after the main campaign. Was wrong about that. :P)