I have three episodes I don't particularly want to see again--"Blackwing" because it's just bad. "Fallen Idol" because Natalie's decision to a) steal Nick's blood and b) inject it into a mentally disabled minor c) without said minor's consent was just two steps too far into the WTF abyss. I don't mind Natalie stealing Nick's blood or going behind his back, but we had a comment from her about ethical human trials in the same season, and the sheer lack of consistency for her character was jarring, and considering the circumstances, pretty gross to me.

And I like certain elements of it, but "Francesca" is not an episode I want to really revisit. I feel certain aspects were poorly executed (maybe not for the time, but they have not aged well) and I just don't like them.

There are a lot of S3 episodes that are dumb or just bad, but those are the standouts for me in terms of the ones that kind of squick me for one reason or another and which I don't want to revist.