This is a decent story, but the execution is a bit slow.
Memory Alpha has a summary here.
There's a sneaky message in here that's kind of interesting. In essence, Ron Moore seems to be arguing that legends - whether they be about Davey Crockett at the Alamo or Kor, the Dahar Master - have an enormous and valuable power to elevate the spirit. And personally, I find it hard to disagree. The tale of George Washington chopping down a cherry tree and then fessing up to his mistake, for example, is almost certainly apocryphal -- but how many early Americans were inspired to do the right thing because of it? While I care about historical accuracy as much as the next person, relentless "de-mythologizing" - the tearing down of harmless fictions - can make us overly cynical and petty.
There are also some nice character moments to be found here. For instance, I love Quark's speech to Ezri regarding what she deserves as a Dax. It is sweet -- and also utterly sincere. And the dignified way in which Kor responds to Martok's mean-spirited taunts is also quite impressive. But as I said above, the overall presentation drags a bit. To be honest, I check my watch a few times, especially when the episode gets bogged down in Martok's back-story with Kor. I understand what Moore was going for there, but that particular scene feels a little too "talky" for my taste.
Moore's basic idea is good, but there's too much telling and not enough showing.
John Colicos and J.G. Hertzler are awesome, of course, but some of the other Klingon performances fall flat.
Yes -- legends do uplift individuals and larger societies.