That's definitely not one of the best episodes of the series, mostly for the reasons you stated. In fact, I honestly think it's the episode that made me stop liking Kate. The way she was taunting Tony about Voss...it was WAY over the line. :-P

It's possible the line you were referring to was *intended* to mean she couldn't comprehend why anyone would change their sex *just* to conceal a crime, but if that was the intent it failed miserably. :-/