Ten years ago this month, I wrote one of the earliest posts on this blog called ‘The Decline of the Simpsons‘ which I referenced again last year on a similar post about another long-running animated series, South Park. I won’t be writing another about The Family Guy, as I was never really into it to begin with and it began broadcasting a few years before I stopped regularly watching television anyway. All three of these shows are amazingly still running as of writing which means there is enough of an audience left to make them worth producing.
By coincidence, I recently came across an infographic by Roshaan Khan with exactly the same title as my post. It was actually made in 2020 and visually presents IMDb user ratings for each episode up to Season 31. It supports my claim the series began to seriously decline in quality beginning with Season 10. I was simply going to add a link to this in my original post but I found I had more to add and so decided to make a dedicated post.

A Memory Called Empire by Arkady Martine, Tor Books, March 26th, 2019
After finishing up the first three of Robert Jordan’s 

