The Qun is the kind of philosophy that is only good for people who can't stand by themselves. Which explains why it's mainly elf slaves who convert to the Qun because that's their only remotely viable option.
As someone who values a lot individual freedom I can only hate such philosophies. Such philosophy deprive people of what separates them from machines : the ability to have opinion and choice. The Qun doesn't just considers itself as the best philosophy ever, it totally forbids you to think of anything different. There are just too many things that I find unacceptable and/or stupid in it :
- The strict gender roles. If I understood well they are based on the belief that even the worst individual of the right gender is still better than the best individual of the wrong gender. For instance, they believe that any female is a better merchant than every male. Or than any male is a better warrior than every female. And for that I disagree, maybe it is different for Qunari race but for humans, elves and dwarves this belief is clearly not true. And even for the Qunari themselves, a female Qunari warrior Inquisitor is probably a better warrior than most Qunari soldiers.
- No family. Even in real world totalitarian regimes, families still exist. This is really a terrible point, for most people family is central and I don't think it's only due to education. To me if you remove family, life becomes rather pointless for most people.
- Mage treatment. Nothing can defend that. Makes Meredith look like a mage-lover.
- 1984-like thought police. No, just no. How can people not born in such a system even consider that as a good thing ?
Also, concerning the Qun vs Orlais comparison, I think Iron Bull greatly underestimates how not having a family affects your everyday life. I just know too many people whose life changed completely (in most cases, for the better) when they got children, despite nothing changed in they professional life, not to consider this as a major issue of the Qun. Also, the random person could have a completely different job under the Qun be it only due to gender restrictions, which can also lead to non-negligeable changes.
So globally I find the Qun to be terrible. Too many negative points. The only other systems in Thedas that I find can compete with it in the "Who is the worst" competition are the Darkspawn and the Tevinter.