Viola was great, but I think her role in the film wasn't very challenging for someone as talented as her. She kinda played a one-note badass. (CCH Pounder could've played this Waller probably given her work on The Shield) A lot of what makes Waller an interesting character in the comics is how she navigates politicians and contemplates the nature of the Squad and its members with the psychiatric staff, so I would've liked to see more of the latter. Of course, that's a far more complex movie than we what got and would've required more time and less bombastic action so of course that couldn't happen.
Still excited to see more of her in the future.