You mean like working with your archetypical brainwashed assassin, letting him grow and develop into the man he could have been? Letting him struggle internally, trying hard to live up to the ideals of his once-mentor - and pretty much succeeding? You mean that sort of development, where a pitiless killer pulls himself up by his bootstraps into an actual hero?
The point was he was built around being this troubled person, he was designed to be this darker edgier character, tailor made for a generation raised on The Punisher and other anti heroes. A generation who is more interested in how much heroes cry than anything else.