4. Nick Fury
There's no question that Nick Fury can run people quite successfully. He's been the long-time head of SHIELD because of his leadership abilities. But he's not beyond getting his hands a bit too dirty and acting out a bit to get his way. He doesn't do well with authority or compromise and can definitely get to be far too brash for his own good. He also likes secrets a bit too much. He defies when he can defy for his own means, and let's just be perfectly clear here: he's had some sensationally stupid political ideas. He was definitely right to go into hiding after brainwashing a select group of superheroes after bringing them together to topple foreign government. Although, I can't lie. A president with an eye-patch would probably be one of the most badass things to ever put on our currency.