While Klingons like to speak of their "ancient" culture and Kahless and whatnot, it doesn't seem as if the Klingon culture of TOS or ENT would really be too similar to the Klingon culture of TNG.
I really got fed up with the TNG era Klingons. They really are a one-note race, now, like the Borg and the Romulans. At least the Cardassians were better treated on DS9.
I mean, I like the honour thing but, the TNG Klingons are nothing like their TOS counterparts, culture-wise. I'm all for making them distinct, but they took it too far, imo.