Memory Alpha has a summary here.
To be honest, this episode could've been a lot worse. Consider the factors working against its success:
- It takes place in the Mirror Universe, which is by now a very, very tired concept.
- The FQ - the Ferengi Quotient - is a moderately dangerous three.
- Did I mention that it takes place in the Mirror Universe -- otherwise known as the Playground of the Id?
Blah. That's my final comment.
The performances were oddly subdued for a Mirror Universe episode.
Message? What message? We don't need no stinkin' message.