Plenty of well-trained small fighters out there, regardless of gender, that can take out opponents twice their size. Plus she's smart, so what? And she lost against the Predator, twice I believe, before winning. Learned how to defeat him. What's the word for that again....? Right, earned her victory. That's it. The usuall All American White Male hero of these movies are always depicted as having earned their stripes be learning combat and whatever. This movie clearly shows us she learned combat. Her training shots show she is more than capable of hitting a target, just no experience yet with moving targets. Which she, again, learns here. Mary Sue is an overused term for people who already have their judgement down about female characters before even seeing the movie. There's no winning. They see a trailer, see a young female protagonist and already fill in the blanks before watching the movie. They have already formed an opinion and watch the movie for any small tidbit that can me mis-used to reinforce a falsely established concept. They're not going in open minded.