I'm against feminism as a whole because it's just a support group for people who are sexist towards men.
I am also against sexism and the "short brown hair muscular caucasian male" stereotypicla character. When I saw that add, for a few seconds I thought it meant "money spent on girlfriend>money spent on game", but then I realized what they were really going for, and that it was straight up sexist.
I don't think people support sexism. The problem is due to the majority of gamers, a game featuring a SBHMCM protagonist is likely going to sell better than say, a skinny Hispanic American with a combover, or a women is her thirties who has lost her figure. I personally want to play more games that get farther away from the SBHMCMP. It's all about reaching the lowest common denominator. If we want more games like Saint's Row 2 that allow you to make your character basically whatever you want, or like Half Life where the protagonist is skinny with glasses, then we have to stop buying games like Gears of War.
Now, when it comes to using women's sex appeal to sell games, yes, it does happen all too often, and it is wrong, but the male characters are going through a similar treatment. What do you think we guys think when we see someone like Kratos walking around shirtless and ripped killing people? We idolize those kinds of bodies, and compare them to our own. We try to hit the gym more and go through tons of protein mix, but we are never going to meet our own expectations because character designers can design characters to be as ripped as possible, without going through years of weightlifting. Some of us even get to the point where we feel ashamed of our bodies. Besides, would women rather have a muscular powerhouse for some eyecandy while playing a game, or just some skinny twig boy?
But more to the root of why the way women are treated in games is so bad is because the way they are objectified. Giant freak of nature titties, perfect asses, long legs, tons of makeup, and let's not forget, video game women do not have to wax hair. It's like saying "Hey boys, women are objects for you to look at and eye rape, and if a woman is unattractive they are not even worth your time." Then you have the unreal standards impsoed upon women. I'm sure almost all of us can agree that sexism is bad.
The problem? Sex sells. "If you are going to play video games, you might as well have some eye candy, right?" I am not immune to this. In Dragon Age 2, Isabella is one of the best features in the game. I got a gaming magazine with Laura Croft on the front, her face covered in mud, and after a few seconds checking out the pictures, I wanted to get the game. I don't even play Tomb Raider. Not unless you count perving out to it as a child back on the PS1.
So where do we go from here? Well, look around. Models advertise products, football teams have cheerleaders, MMA fights have girls in bikinis for no reason. Sex, friggin, sells. It's not right, but it does. We are not going to be able to keep the T&A out of games until we can get that out of other things as well. All we can do is try to avoid blatant sexism like that advertisement. Don't buy games based on jiggle physics, but by quality. Demand more realistic characters from designers. Realism is, unfortunately, pretty big in gaming right now, so why don't we have realistic characters?