I think that's still very much open for debate. Although it's not quite politically touchable yet, there's broad concern about their net effect on ships such as AC Carriers and in other roles. Having women in MOSs (jobs) that are distributed at both combat units (regimental level and below) and at rear units deprives both of experience from one another.
From my limited experience, women as Division level intelligence analysts were slightly limited due to their lack of experience with the grunts in Battalion or Regimental level roles. But more importantly, high female to male ratios at Division levels denied training and positions to lower level analysts.
There was some animosity toward women Marines having lower PT standards than the men. Why should they not be required to be a fit as males? In generally, they had a number of disadvantages, some genetic and some cultural, that from my perspective kept them a step or two behind men. I knew of many women who more than pulled their weight, one or two very exceptional ones, but not as many as men.
What I'm saying is that unless the culture has changed radically from 1985, and the stories I read of the problems are just right wing rants that are only read here, they are failing to perform in some roles and they've been pushed a little further than they should be.