I know everyone probably has their own take on this. For me, Season 13 was still peak Simpsons, with a huge amount of wit and funny stories. Seasons 14 was more of a mixed bag, with a lot of mediocre episodes. Season 15 was the first season where I didn't laugh once or enjoy a single episode. So for me the answer is: Season 15
I'd be curious to learn what changed around Seasons 14/15 in terms of key personnel or anything else that might explain the decline.
I'd be curious to learn what changed around Seasons 14/15 in terms of key personnel or anything else that might explain the decline.