Also, so far as the audience sees, the only Klingon in the galaxy who really puts honor before all else is Worf. Otherwise we see a bunch of politicians and hypocrites, scheming and plotting to build up their house's power.
As far as Worf is concerned, I like to think it's because he grew up outside the empire. He holds himself up to the 'ideal' of Klingon honor, because he grew up in an enviroment entirely seperated from the homeworld. A lot of what he believes is true Klingon behaviour he probably learnt "second hand" rather than being exposed to it in his youth. So as an adult he holds himself up to some mythological profile that no other 'actual' Klingon we see ever meets.
The way I see it, other Klingons talk big about honor, but they don't practice what they preach. Worf does practice the 'PR version' of Klingon honor, because he doesn't know any better.![]()
I think ENT may have touched upon this, but there'd have to be a caste system in which the greatest power and prestige went to the warriors, but the brains and grunts who enable them to be warriors would gain honor in their own way for doing so.
I find it problematic to say that Worf is the only honorable Klingon, only because, like what Worf tends to do, it requires using a definition from outside Klingon culture. Indeed, honor is a lot like chivalry. The conduct of knights during the Middle Ages could often be described as being unchivalrous. However, the word referenced a code of conduct in which behavior, speech, rituals, and responses are formalized. The literature of the era, moreover, wraps in an air of romance. Similarly, Klingon honor requires following the rituals and attitudes and meet the expectations of one's place in the hierarchy. Worf may believe that Gorwon is not honorable for attacking Cardassia without provocation, but that's a human definition. On the other hand, Gowron believing Worf is dishonorable for ignoring his oath of loyalty is perfectly Klingon--perfectly consistent with the code of honor. By the end of the series, Worf finds someone--Martok--whose notion of honor is more in line with his, and who would want Klingon society to be more equitable rather than loyalty driven.
Gowron's dishonor isn't because he invaded Cardassia. Gowron is relentlessly politicial. He took personal credit for the victory over the Romulans in Redemption. When he wanted to charge the Dominion on his own at the end of DS9 instead of waiting for the Federation and Romulans to protect their ships it was all about solidifying his position of power and putting himself in the position to take the credit.
If there are any other honorable klingons than Worf in TNG, it's people like Kurn and Dax's revenge squad.
When Ezri lectured Worf about her opinion of the Klingon Empire, she was just saying what twelve seasons of two series had shown to us.