While SC6 is certainly bad for all the reasons you describe, and the feature where you can knock clothes off is atrocious, I will say that my wife who doesn't play games at all really gravitated towards the character designs which shocked me. There's a lot of women on the roster which is good, and obviously the boob physics and underwear shots are incredibly stupid and crass but she said characters like Sophitia are like a female power fantasy to her. She's powerful, beautiful, and desirable. It sounded a lot like the way people talk about Bayonetta (which I have never played).
My wife said she had a similar reaction to SC2 when her brother got it when they were kids and she found all the female characters very cool and memorable. She has no interest in video games and never pointed anything else out in anything else I was playing so it was surprising. She even wanted to play SC6 and use Sophitia, and the only other games I've seen her play are iOS puzzle games. My wife has strong opinions when it comes to women's depiction in media so I was shocked she didn't think the game was simply extremely sexist (like I did). It was an interesting perspective to me as a man. I don't think we give a lot of attention to creating characters that are female power fantasies. Probably because men would be uncomfortable with what that looks like.