No clue what you're talking about on the running thing. She's running quickly and covering herself from falling debris. How else is someone supposed to run away from a monster?

Her first scene in The Avengers immediately cemented her as a bad ass in my book.

But your reasoning for that doesn't hold up giving the example you used. She has a hurt leg when she is running from the Hulk, she is 'limp-running' because she is in pain.

Not disagreeing with you about her in Iron Man 2, though.

I did watch it, I just listened to the DiF comm. She limps up the stairs (she has to use both hands for support) and watch her drag her leg just before Hulk grabs the grate from underneath her.

Anyway, even if I'm wrong and she's not in pain and not limping, I don't see anything wrong with the way she moves in this film. Who says spies have to move in a certain way?