At best, he is a very prolific vigilante. One who makes mistakes, and gets innocent people around him killed. But beyond that, he is a serial killer first and foremost. He kills bad guys because he was trained to from an early age, but if he had been left to his own devices, his urge to kill is not discriminatory. Hed be killing innocents, because ultimately its not about serving justice, its about the fact he enjoys seeing the life leave someones eyes. So is he a good guy? I think the answer has to be no. Still, hes better than most who wind up on his table, thanks to his code and personal principles he has developed over time. At the end of the day, his actions have also saved a lot of lives. But saving lives does not give someone the right or moral currency to murder.