So... you're not writing believable female characters if they're the same as the male ones; but you're also not writing believable female characters if they're different from the male ones?
I should really just call you a dumb troll and move on, because I never actually espoused the second half of that anywhere in the thread, or perhaps play this for comedy like Battman did with a similar situation. Or I could mock you for not understanding that I'm very deliberately making a referent to only
one Mass Effect character and possibly anyone who comes from a similar background.
But I'll do you the courtesy of a serious reply.
N7 is painted on Shepard's armor. It is an open statement of a lifetime spent in military service of a very intensive, very invasive variety. That N7 will result in a uniformity of thought and behavior well beyond the norm, one that will flatten the range of possible responses hugely. Writing
Shepard very differently based on gender would probably be a mistake.
(As for the other characters the only one I thought it really openly mattered they were female was Samara's post-killing-Morinith period, but that's not the same thing as the others being well or badly written; I 'd have to play the games again to offer an opinion on the other characters.)