Okay, I got it figured out keeping track of which Spongebob episodes I've seen and which episode is worthy to review. Here's how it works with demonstration of my most known of the Seasonal Rot seasons.
*Unmarked: I haven't seen it, or I don't remember it.
*Atrocity: It's an Animated Atrocity, plain and simple.
*Debatable: This might be an Animated Atrocity. Take SquidBob Tentacle Pants. The episode has a pretty good plot and would be a "good episode" if it wasn't for that fucking flesh-colored blob at the end. Driven to Tears is one of the most moderate "Patrick's a Prick" episode.
*Good: The episode is tolerable. It doesn't really mean that it's "good" perse, but it does mean that it's watchable. Remember, that I may have some controversial picks. I've seen both Rule of Dumb and Wigstruck and worst lists, so if an episode you don't like is marked as "good" don't take it too seriously. It just means that I found some good in it.