@Tzeetchian Apostrophe: I can only answer your last question as you're appealing to my opinion.
The answer would be "No." Though I'm not sure why my morality system should be at all relevant to you.
Concerning killing a man and still being good... I don't have time to tell you if you'd be a good person, or if someone else is good. I can say only that the situations wherein I would recover mentally from killing another human being would be small - and I would never consider killing another human being something I would justify. It is always wrong for me to do it.
I could also say that I would absolutely oppose any individual trying to kill another person. That might even bring me into my initial conflict of coming to a place of killing that person to stop him/her. Again, I do not consider myself good for doing it, nor do I justify the action as good simply to lie to myself that it was the only recourse. It was simply the only one I thought of.
Concerning video games - because of their simplistic childish morality, I do often just accept "Paragon" = "As Good as it's gonna get". And I do often ignore the murder-fest I have to go through in the combat obstacle courses when thinking about my character's personality.
However - when it comes to threads like these... the idea that someone killing more people would make you more evil than the character already presented... is a bit laughable to me. Hence my statement that none of Bioware's protagonist are "good" people. Which can only be through the lens of my morality (as yours, is through yours). I can't, and won't, speak to how someone does, or should, see the characters - but I'm also not going to shy away from confidently stating my view on the topic (as you, and anyone else posting, is doing). That you find my opinion untenable - is not the fault of me, nor my opinion.