Scarlett Johansen, I love. The choice to use Lucha Libre for her fighting style was brilliant. But I've seen so many bad Marvel castings that even the good ones I have to ban in my banket ban on movie PBs. I would gladly sacrifice a RDJ Iron Man to make sure I don't get an Aaron Sanford Pyro.
Lemme see: Pepper Potts, Mary Jane Watson, Jean Grey, Crystal, Black Widow, Siryn, Rachel Grey, Medusa, Firestar, Wolfsbane, Colleen Wing, oh and Mystique counts.