To be fair, that's better than most shows could ask for. I'd say all of the episodes are worth a watch at least once since they're just all enjoyable in their own way (Aside from most of the island arc, but that seems to vary from person to person.)
It just really sticks out like a sore thumb in S2 is the issue. In S1 they have an excuse to stay in Corona for so long since, you know, they live there. But in S2, despite it being a road trip, they seem oddly stationary in a lot of the locations they visit so those episodes feel like more of a waste of time than they actually are. It doesn't help the island arc could not be a more contrived excuse to just get the characters on an island for merch- er, I mean wacky shenanigans just because. S2's pacing doesn't really get consistent until Great Tree onward where it's super smooth sailing.
I'm hoping S3's pacing is a lot more consistent considering the stakes are insanely higher now, so it's gonna be harder to justify episodes where little of consequence really happens.