I didn't have a problem with Dukat turning to the Pah-Wraiths during his crazy period. After his daughter's death, I'd say it was a believeable reaction. He wanted to use them for his own means, which fits in with his character of old.
I was more bothered by how this turned into a Prophet vs Pah-Wraith showdown in the last episode. The Kai Winn/Dukat storyline was interesting, but used wrongly I think. The way that it developed into such a black and white story is disappointing, and it tarnishes Dukat's character somewhat. There was so much good that came before all this though, so I sort of let them off for it.
I was more bothered by how this turned into a Prophet vs Pah-Wraith showdown in the last episode. The Kai Winn/Dukat storyline was interesting, but used wrongly I think. The way that it developed into such a black and white story is disappointing, and it tarnishes Dukat's character somewhat. There was so much good that came before all this though, so I sort of let them off for it.