Since it was definitely her, and not the writers, producers, and Whedon who controlled the character and storyline. I've never understood blaming an actor for the writing direction a show takes, since the actor has no control over that. Yes, she's the visible "face" of the thing you don't like, but she has no personal responsibility for it. It's like blaming the Gerber Baby if you don't like the stewed carrots.
And to tie in to the show, it's like blaming Liz Tyler if you hate that her sister was in the homeless camp the whole time. Very different than disliking the way she plays the character (which she does have input and a lot of control over), which is an entirely distinct situation.