it certainly is interesting to get a different perspective on humans from a race other than the vulcans. Here’s another time Quark opined on humanity, this time to Sisko (from The Jem’Hadar):

Quark: I think I figured out why Humans don’t like Ferengi.
Sisko: Not now, Quark.
Quark: The way I see it, Humans used to be a lot like Ferengi: greedy, acquisitive, interested only in profit. We’re a constant reminder of a part of your past you’d like to forget.
Sisko: Quark, we don’t have time for this.
Quark: You’re overlooking something. Humans used to be a lot worse than the Ferengi: slavery, concentration camps, interstellar wars. We have nothing in our past that approaches that kind of barbarism. You see? We’re nothing like you… we’re better.

while I do find the Klingon rigidity around “honor” both annoying and, at this point, simply unimaginative and boring, I found the fact that Gowron was even willing to entertain the whole exercise, that the Klingon High Council itself was open-minded enough - in the face of their inflexible culture and honor, etc - to allow a Ferengi in and tell them where the bear shits without, ya know, getting all racist and xenophobic about it was pretty cool of them. In a way, all of that boring, annoying Klingon honor bullshit really served to juxtapose the silly Ferengi crap in a way that made them look surprisingly open-minded and flexible in this episode. and it was funny in this case.

so… as annoying and dull as it can be, it has its place.

on other occasions, as with when Kor met Jadzia for the first time and simply was happy to see his old friend Dax, recognizing Jadzia as the same person as he had know Curzon shows open-mindedness to gender-acceptance. This is extended to other Klingons explaining how women in their culture are seen as equals, warriors who fight alongside them in battle, etc., and other dialogue cues that, although there is a caste system with warriors on top, wrt sex, race, gender, etc, there is equality in there society.

edit: of note: I know that in my example from Blood Oath Kang and Trelane in Koloth cosplay didn’t accept Jadzia at first, but I’ll remind you that

Ja! As I recall he’s kind of a momma’s boy so it sorta fits.