Angela Bassett? They couldn't have hired a fat chick to actually LOOK like Waller? What about CCH Pounder, who did her voice in the JL cartoon?
Yes, they should have gotten Pounder but this is hardly the sort of thing (casting someone in a supporting role that doesn't look exactly like their comic book counterpart) that's going to ruin a franchise. For example, Michael Caine looks nothing like the comic book Alfred but no one seems to care.
I'm also sure there are a lot of old school Iron Man fans asking why a black guy is playing Nick Fury as well. Doubt it stopped anyone enjoying the films.
There has been instances of main characters not looking anything like their comic book counterparts, just as there have been supporting characters or villains that look nothing like them, but its rarely down to that if a film fails or not.
Was the Catwoman film a failure cause they cast a black woman in the role? Was Daredevil less than successful because the Kingpin was black? Did Batman 1989 lose any viewers because Harvey Dent was Lando Calrission? Was X-Men weakened at all because they didnt pick a younger woman to play Jean Grey?