My favorite is Civil Defense. It was a great idea for a bottle show. You got Dukat coming in all smug and superior only to get knocked down. It has Dukat and Garak going off on each other, which is always fun.
O'Brien forgot to reformat the hard drive.
Of all the Disaster type episodes in Trek, Civil Defense is the most fun, especially Garak calling out Dukat as he hit on Kira.