This episode, along with "The Emperor's New Cloak", showcases the death gasps of the Mirror Universe. It was a cool concept and generated at least one great episode ("Crossover"), but by this point didn't offer much more than sentimental soap opera.
Vedek Bareil was never the most interesting character (Philip Anglim's banal performance is probably at fault), and his "flawed" counterpart fails to generate much firework. It's hard to see what Kira sees in him, much less the hedonistic Intendant.
There are a few lighthearted moments - the double date with Worf and Jadzia, the encounter with Quark - but that's about it.