I always thought the Katee Sackhoff thing was lazy casting. Oh, she played a tough girl in a show and is blonde. Perfect. If GAF had gotten its way before Edge of Tomorrow came out, not one person would have even mentioned Emily Blunt.
Katee Sackhoff isn't a great actor, but she can deliver her lines. Rousey so far has gotten roles where she really didn't have to show any type of emotional range, just had to spit out a line, and she barely pulls that off. She isn't an actress. It just makes no sense to put a film franchise on her shoulders.
These are comic movies, and Marvel rarely strays from their formula so we don't need Oscar quality actors. But someone with range would be nice.
I'm not hating on anyone who wants either actress. I just think fans can do better than cosplay casting. Some of the best performances in these genre movies have come from actors who the fans collectively would not have chosen.