I commented about this in another comic book group I belong to. Her character may not necessarily be a "****", but she'll do anything to come out on top of every situation.
Widow: The truth is a matter of circumstances, it's not all things to all people all the time. And neither am I.
Cap: That's a tough way to live.
Widow: It's a good way not to die, though.
Cap: You know, it's kind of hard to trust someone when you don't know who that someone really is.
Widow: Yeah. Who do you want me to be?
Cap: How about a friend?
Widow: [chuckles] Well, there's a chance you might be in the wrong business, Rogers.
I know people think she doesn't deserve her own movie, but I think she's a fascinating character. Glad they at least keep putting her in as a supporting character into all these other MCU movies.