In TNG's "The Wounded", though it's a different Cardassian played by the same actor as Dukat, the episode sums up what I think of Cardassians. From the start they were devious with an ulterior motive.
That's an awfully bigoted statement. There are plenty of honest and honorable Cardassians, too -- not the least of whom would be Gul Macet, Marc Alaimo's character in "The Wounded," who clearly realized that he had a lot in common with and respected the Federates aboard the Enterprise
, and who was clearly uncomfortable with his government's covert re-arming program.