Personally I'm okay with a smaller amount of generic female enemies because at that time there were much fewer female fighters than there were male. However, this is coming from a white, male, heterosexual who comes from an English speaking, first world country so I might not be the best person to ask if representation is fair.
"That time"? What time?
1) the DA world does not correlate to any real world time, so charges of "it makes sense because this is how things were like at that time," is a nonsensical claim to begin with.
2) The DA world is already shown to be radically different than any real world period anyway. Even if you could argue (from a technological standpoint, say) that there is a correlation to a real world era, that would remain irrelevant because the canonical lore of DA already establishes that it lacks the same real-world ideas about gender roles.
3) Women have ALWAYS fought in greater numbers than people nowadays want to admit. Many of our ideas of "women didn't DO that back then, and any who did were purely exceptions to the rule," are based on misconceptions. This is not to claim that women have always fought in every way, shape, and form, in equal numbers and on equal terms as men, but it is TOTALLY false to claim that women fighting has only ever been a noteworthy exception. There have been plenty of cultures throughout the world, and throughout various ages in history, where women fought in numbers far too large for any modern twit to dismiss as just exceptions to the rule.