Not really. You can still become a hero with the Dark Urge. Swen confirmed that during the Panel from Hell. It will be more difficult, though.
But it can be expected there will be situation that spiral out of control. To spice up the things.
See? That's precisely what I'm talking about: "You can become a hero. Swen confirmed it", but Swen didn't make particularly clear that no matter what, you'll be a "hero" (and I can't help but wonder if he's not misusing the word, by the way) that from time to time will maim people without the ability to stop.
The wording seems to suggest that no matter what you will make the ultimate decision on each of your actions, when people who tried it already clarified that this is NOT the case.
