I'd put Dexter up there. Went from one of the most acclaimed Showtime shows that was said to be bringing them on par to HBO then ended with a incest plot and a shitty final season. Now you rarely hear about it. They even got a renewal recently with very little fanfare.
Honestly they should have just stuck with this group. The gigantic time jump to Korra didn't serve the story or world building at all. I'm more interested in how the gang grew up than some dumbass roaring 20s or post apocalypse taking place within 100 years of the original show.
To be fair he makes a decent point. Your coverage of LTT does veer into tint personal territory and I don't think it always stands up to journalistic integrity. That's not to say you haven't caught them messing up but it can also go too far.