I'm not a huge fan of "Waltz" in general. Dukat going crazy is just silly. Honestly, I would have loved to see it go the complete opposite direction, with Dukat becoming more of a good guy, seeking redemption, possibly even helping Sisko on his path as the Emissary. I think that would have been a whole lot more interesting than what we got.
that redemption involved really--truly
realizing the wrong that he'd done, that would have made a very interesting thing. Even though I don't mind the plot as it was.