You don't think near killing him and ending your relationship with him is enough?
You don't think his constant, life-long regret at being wrong at not having thought something through to last tiny detail, given his personality, is enough? Every single day Quinn spends on the Fury is a reminder of his failure. He manages to remain noble after his banishment by Broysc because he knows what he did was right. What he does to the Wrath? He'd torture himself far better than you ever could.
For a darkside Sith? Definatly not enough, its never even spoken of after it happens I don't even know why they added it. After it all happens its never mentioned again I feel thats very out of character for a Sith especially the way I like to play. I'm sure its fine for a light side Sith but defiantly unacceptable for a Dark side Sith.