Blizzard guy is tired of this debate, and so am I. Go ahead and tell the artist that sculpted Kerrigan's ass that they're upholding the patriarchy in video-games by firstly not realistically modelling cellulite on the female body and secondly having the gall to show their character from the back sometimes, and he/she would give you a quizzical look. They are making what they want to make. There is no agenda to be had. Not every game has to hold a political stance on today's hot-button issues - some are just supposed to be fun, and the characters are made with that in mind.
There are plenty of examples of some form of sexism in video-games, along with all media, but generally the visuals is not where this point should be argued. Spend your energy on complaining about the lack of variety in playable protagonists or the stereotypical actions of both male and female characters in games that lead to genuinely dry and uninteresting experiences. Maybe even spend your energy complaining about something like the superfluousness and odd trend of the Heavy Rain and Beyond shower scenes if you really want to, but coming down on a fucking moba for their character designs for not even being inherently bad, but because you think a character could do with one less cup size, is lunacy.
The only thing wrong with the mentioned "Roller derby Nova" is that the design is absolutely abysmal. And no, that's not sexism at work. It's just ugly and uninspired.