timppu: Good point, but then there still seems to be some superhero ingredients, like how "directive 4" is Robocop's kryptonite etc.
I see it as a more fundamental flaw. As what makes robocop not a hero. I guess i see it more politically. The idea that a "perfect policeman" is a machine that follows rules like a computer program, and that privatisation of public services allows for private interests to define these rules. Robocop is the deshumanisation of a policeman, and the logic of both legalism and privatisation pushed to an extreme (thinking of it, yes, they are two right-wing values : strict police enforcement, and private interests before state). So, directive 4 is directly robocop. It's his purpose. Not an exterior threat but his own nature. The robocop is a social timebomb. Fighting directive 4 is a self-destruction - and robocop can't. He depends on others to invalidate, contextually, the directive's condition. He's still an OCP tool, by design.
It's a bit different from kryptonite, or yellow colour for the green thingies guys. Directive 4 illustrates the reason why robocop should not exist. And why robocop is the enemy of alex murphy. Maybe, in a way, directive 4 would be closer to the hulk's rage (I don't know hulk well, is his green state a liability for good guys too?). That's one superhero parallel one could make. But again, hulk is probably a weird kind of superhero : in the same way, his "power" makes him more under-human than super-human. Or maybe both relate to doctor jekyll, in some way.
Or it's a matter of perspective. But this is the angle through which I percieve these things.