Ronda Rousey
Don't ge me wrong - I have a huge respect for this woman and she is obviously a very talented and successful MMA fighter. But please... could someone tell her to stick to professional fighting instead of acting? She was horribly miscast. In this movie she only had two facial expressions: first, a fake toothpaste-ad smile that would even give the prom queen a run for her money and second, that pissed-off stinkeye look basically saying "You *beep* with me and I will kill you". And when she opened her mouth to say something with that blank stare on her face, I honestly thought she was reading her lines off a teleprompter. Her fight scenes weren't that good either... where were her famous high-kicks she used to flatten so many of her opponents? Not in this movie.
So please, dear Ronda, do what you do best: fighting the MMA!