Like TNG's "Suddenly Human", this episode starts from the premise of an interstellar custody battle. But this is not TNG, and that initial premise develops into something much more interesting than another "issue show".
This episode is titled "Cardassians" for a reason. We get Garak's 2nd appearance on the show, and the first substantive look at Gul Dukat. Those two characters pretty much dominate the episode when they're onscreen. But you have nice assists from Bashir and Sisko, with a particularly amusing late-night runabout scene. The O'Brien scenes seem a little grafted on, though obviously relevant to the character. One final note: the Cardassian orphans scene on Bajor is truly heartbreaking.
Overall, recommended - a great sign of the show's decreasing dependence on the 2nd- and 3rd-tier episodes that populated the 1st season.