From what I understand, this is not a reboot or a remake. But a continuation of the original. I will watch only because of Kristen Wiig. To me she is a good actor and a great comedic actor. Melissa McCarthy on the other hand is not quite up in the acting skills. I've seen some of her movies and McCarthy's characters always end up being the same.
But why should it matter if it's an all female cast? If Tina Fey, Kristen Wiig, Amy Poehler, Wanda Sykes were playing the core team, would we even have this discussion of feminism? People are already expecting it to be bad, so people will poke holes in the premise at every angle. Even the ones that really shouldn't matter like gender of the protagonists.
TBH, It doesn't look that bad. But it doesn't look that good either.