I thought her portrayal was pretty awesome in all the films she's been in. The only thing I want is for her to use her Russian accent, it makes sense for her to talk American in America. But at some point I'd like to see her revert to her normal accent. I'm not sure if she's capable of pulling that off though, thus my one disappointment with the character.
Other than that I think she's sexy, mysterious, and dangerous just like in the comics.