BW was more like Melinda May in IM2, more of a silent, bruiser type of agent.
In the comics, depending on who's writing her, she can be quippy and banter with the others. I remember her bantering when Brubaker wrote her with Bucky and when she was on Secret Avengers. Even in the main Avengers books she has her moments of levity. In the trailer, the
reminds me of a couple of panels in her most recent series by Nathan Edmondson and Phil Noto where she
She's brutal and efficient, and she talks out of both sides of her mouth.
To each their own, but I find ScarJo's interpretation in Avengers and what we've seen so far in the trailers to be very close to canon Widow, what I've read at least.