Man, the feminists are all over this game on twitter.
TIL that Ed Boon and NRS as a whole are sexists
NRS has had some pretty big problems with female characters in the past, but honestly as of MKX and now Injustice 2 they've improved quite a bit with their character designs and outfit designs. They're working on being better and while they're not quiiite there yet it's at least been some good progress. Especially since they've put a lot of focus on making the MK girls have major story roles and a lot of personality, as well as outfits that aren't just like strips of cloth wrapped around their nipples. MKX was solid. Not perfect but solid. Injustice 2 doesn't seem to have any problems other than the typical half-naked superheroine stuff that's been standard for these characters, unfortunately, for decades now.
I haven't seen anyone really voice any problems with Injustice 2 specifically that aren't really just problems with the comic book industry or video game industry as a whole though so I dunno what you ran into. But it's probably just more of that.
Like I said, at least NRS is making an effort to improve their designs. And with this game, you can customize people and give them looks that are less provocative if you want, which is also good.