Ugh, Sons of Mogh. Between that and Rules of Engagement, it seemed like the only reason they wanted Worf on DS9 was it put him in horrible situations where he made bad choices.
After watching SOM when it aired I was certain we'd see Kurn again. It seemed kind of open-ended to me. I remember thinking that he was going to get his memory back (Klingon redundant physiology and all) and be suuuuper pissed, especially after seeing Worf become BFFs with Martok. But nope, that was really it for Kurn. What a sucky ending for such a good character.