system
A chat on subreddit /r/me_irl
human
The Simspons begun to drop around S18 and then became worse slowly. Let's hope Bobs will follow  another track.
gpt
Simpsons began to drop long before that.

it's peak quality years were S2-S9.

Good years were S10-S13.  past S13 is pretty much universally ascribed as decent to mediocre.