I'm horribly torn when it comes to things like Anita Sarkeesian. I am a feminist and I fully agree that the portrayal of women in a number of mediums, and certainly in my favorite of them: video games and comic books; need to be improved.
That said, from what I've seen of Anita Sarkeesian, she seems to doing a terrible job of bringing attention to that issues. She skews the truth, when there are REAL problems to focus on; and as a result, no one's paying attention to the problem, they're all paying attention to her. Instead of debating the actual issues, everyone's debating HER. If she wants to keep focus on the problems, she should stay focused on real problems, and not make stuff up. It is sexist if a game encourages misogyny, its not sexist if, purely through player choice, and with equal opportunity to do the same to men, players CAN by misogynistic in a game.
While I'm admittedly off-put by Thunderf00t's obsession with raging at feminists lately, I have watched a few of his videos and he breaks down the problem with her claiming Hitman is sexist pretty well. Just because a few strippers HAPPEN to be killable, in a game where pretty much EVERY random NPC is killable, male or female; and the game in NO WAY incentivizes you to kill said strippers; and in fact, penalizes you for it... its not sexist for them to merely exist in a game. Sure, its kind of sexist if players go out of their way to kill the strippers, but that's on the player. I'm sure there are some black NPCs in those games too, and its hardly racist on the developer's part if the PLAYERS opt to go out of their way to kill them for being black. In fact, in this case, Anita Sarkeesian reminds me of that guy who was claiming Left 4 Dead 2 was racist, because it had black zombies. Yes, there are black zombies, ignoring the fact that there are white zombies (not to be confused with White Zombie. badumtish) and the game encourages you to kill them both equally.
I certainly agree with the people saying she should give positive examples as well. Its not to say "look, there are some games that aren't sexist so we can all stop trying", its to point to those games and go "Look, people, THAT is how you do it."