Yeah, Cassie suffered the most at the hands of the ghostwriters. She's got a lot of subtle depths to her, and sadly it's the subtle depths that went out of the window when the Ghostwriters came in.

Really, I don't think you could argue that any of them are weak. And when Cassie chose the moral option, she didn't do it because she was afraid of because she didn't have the strength to do otherwise. She did it because she believed it was right - and regardless of whether you think she was right, it takes an amazing amount of conviction to be able to do that.