Ok but I'm pretty sure most comment sections are like that for a lot of episodes of the first 3 seasons?
A couple on the first page do say it's meh or not good, but it's not like it's even won H&Hs lately. If you want to go by how much overhyped praise they go by, Band Geeks gets much more considering how many comments there are 11/10.
Also doesn't make sense that you would give it 19/20 and call it overrated knowing that your favorite, Band Geeks, gets much more praise but you somehow want to call it underrated when it pretty much isn't. It's like the Lion King of SpongeBob episodes in that it's most people's go-to favorite episode.