"The most powerful and influential characters have been women"
What are you smoking? They can become Divines in the Chantry, but the Chantry's a glorified nunnery, the males being more isolative monks or church workers, as are women. Being a Divine doesn't even mean you're that powerful, unless those who follow Andraste are on your side.
Gaider's not a very talented writer, hasn't been for a long time. I don't care what he thinks is "Middle Ages" or not, but he's wrong if he thinks Inquisition is it.
The Divine isn't powerful?
What game have you been playing? The last I checked being able to call an Exalted March for whatever reason is pretty darn powerful. IMO.
Who ruled Orlais? Empress Celene.
"The Rivaini are traditionally a matriarchal people and many believe that women are best suited to ruling. Most Rivaini communities are governed by elder women, the most senior of these women being the above-mentioned seers" (http://dragonage.wikia.com/wiki/Rivain)
Who ruled Kirkwall with an Iron Fist. It certainly wasn't that limp noodle Dumar, it was Meredith.
Who ruled Fereldan in DAO? It wasn't that moron King Calian, it was Queen Anora.
So yeah. What are you smoking? Obviously the games you picture in your mind aren't what's being made.
As for Gaider, You can say what you want about him, I don't think he's the greatest writer in the world. However, I doubt he ever claimed DAI was supposed to mirror Europe in the Middle Ages 100%. That's just what you want.