See, I kinda see a problem there.
Why do you say it like that? "very female inclusive" instead of just saying not sexist. Or simply leave it aside entirely because sexism should not be the default go-to for a game, and therefore shouldn't need to specifically mention that it's not?
If you're really going for a genuine historic feel(you keep saying documentary like it's a buzzword, I don't know if someone else did first but please stop it's getting annoying), then yeah, showing things how they were is alright, but the society within the game being sexist is different from the game itself being sexist. If there are female characters who break apart from the mold their society expects from them, in-game, and show that their entire gender isn't represented by the oppression the culture within the game, that is avoiding sexism. But if a game claims that women and men are equally represented throughout the world, and fails to make good on that claim(see: Dragon Age: Origins) and has very few good examples of female characters, NPC or no, so that most women encountered fit the mold that many people who've been subsumed in this culturally-reinforced sexism expect, that is sexism.
It's not just about the parts within the game, though that can play a role, it's the game itself.
But on a different aspect of that; why is it bad, at all, for a game to have an equal-gender society in it? Hell, what's wrong with it having a female-dominated one? I can think of very logical explanations why lineages might be passed down from mother to daughter, rather than father to son; for one thing, you can be sure the baby has your bloodline, which was more difficult to do with male inheritance in medeival times. For another, if it's a society in which men are the ones who typically go to war, the women have less risk of dying on the battlefield and leaving the house without an heir. And so on. But the problem is this: If it's a male-dominated medeival society, we don't ask for explanations. We just take it as the norm and move on, but if you try to make a world dominated by women, it's damned likely that people will always ask why it's female-dominated, or ask why there isn't equality instead, etc. And while if you go deep enough, there's some good reasons for these questions(mostly being that men are more likely to be physically adept than women, and thus in a less civilized society they could bully the women into doing what they want, and the trend of that would continue into later societies etc.), most people don't have that as their reason for asking. They're just offended that men would be placed into a secondary position, as women have been forced into for so many years.
Mind you, I'm not talking about the ridiculous parodies that are trying to raise sympathies for 'the poor oppressed men' by exaggerating the effect when the roles are reversed, I'm talking about where that's simply part of the setting. It's not the focus of the story, it's the background for it. It might play a role in the story for one reason or another, but there's no reason for it to be particularly noticable, other than the fact that it's unusual in our culture as a subversion of typical gender roles throughout history.
Okay, I think I'm done for now since I started to confuse myself.