I agree with this statement. I really didn't like 9 or 10 either but 12 seems to be worse.That is very true. I think the true renaissance of the show was Season 9b and Season 10. There have been a few episodes in S12 that are very season 6 esque, especailly the Nitwitting.
We'll find out soon but you could be right!
If that's the case then I needed to stop watching after the Birthday special
...Wait a minute!
If "SpongeBob's Birthday Blowout" really was Stephen Hillenburg's final episode, then why did "Karen's Baby" and "The Krusty Bucket" still have him listed as an executive producer?