I voted for Benjamin Franklin as the worst episode from this production day. It was easily the weakest link of an episode from this day. I do NOT think it is a bad episode at all. It just doesn't stack up against the three amazing wins. And Peter and Michelle should've honestly won too.
Imagine if they did win though? Then it would be hell to pick the worst episode.

(My vote might've been Atocha, mostly due to the really long moat. But damn, all these episodes would've been great if Benjamin Franklin was a win)