Season one
Best: I dream of Jeannie Cusamano
Worst: A hit is a hit

Season two
Best: Knight in White Satin Armor / Funhouse
Worst: D Girl

Season three
Best: Pine Barrens
Worst: unsure

Season four
Best: Whoever did this / Whitecaps
Worst: not sure, I'll have to watch again, probably an episode with Janice in it a lot.

I found it easier to pick the worst episode from the first two seasons, because most of the episodes are great, whereas the last two seasons have a few episodes that I could pick, I'm just not sure which one.