My Opinion has changed a little, and even as a no nonsense Dark V since L30 SW I recently played out the encounter and I am happy enough with the outcome, He has been Invaluble to me and the crew , Useful team player and depedable ( besides his AI bug that stops him from healing me he has killed me more than once that way hehehe) and made one slip up and not a very good attempt at that (was he not trying very hard?).
It would have been nice to have the option to kill him, But he is still useful, and there are easier ways to kill a sith lord, Bomb on the Ship for example having free run of the ship he could have done that easy.
But seeing what he has done for me in the past I am willing to give him one and only one more chance.