Happy Days?

I'm not exactly sure WHEN it was, but there was a point where it just wasn't worth the trouble to watch anymore.
That was the one that immediately popped in my head. Of course that show was the origin of "jumping the shark" after all. Every now and then I'll be flipping through the channels and see a rerun, and I can't even watch it for 5 minutes. I'm like, how in the hell did I watch this when it was on?
Let's remember that Happy Days JTS moment was not Fonzie JTS - it was Richie's departure. Also, JTS is not the end - it is the moment that, in retrospect, that the decline started.
The Simpsons is definitely one, but I'll lay odds that if that final kill order is ever given, the ep quality will increase dramatically for the last set.
MASH I'm torn on. I would have persuaded Gary Burghoff to remain through the end of the 8th Season, and concluded the series with that. Then, maybe, a series of 'AfterMASH' TV-movies with individual cast members back home, concluding with a 1963 reunion ruined by the news from Dallas.
On a side note, I watched a rerun shown on Fox's NYC affiliate in HD - a later rerun. If you think Alda's hair grayed during the later run, you ain't seen nothing yet.
My Three Sons, even in reruns, seemed to continue forever and nine days. Wow. I was expecting Ernie and Dodie to be married off before all was done.
I think Wings would be improved by eliminating the middle seasons, the ones where Joe went from merely long-suffering to complete doormat.
I liked Charmed, but the final storylines all seemed like a loop : Neo-Master #Nth, Determined San Fran Police Investigator #Umpteen, and Leo/Piper Interruptus # Kerzillionty. And then there's Billy...
Back to Happy Days : I liked its finale, except for how tacked-on Ron Howard's appearance felt. His old pal was adopting a kid, and there was no interaction with him, even to say, 'You've got a great new Dad'. When Fonzie reminisces with Richie about how they met to fight, and now are attending 'his sister's wedding' without mentioning the fact that she's marrying his cousin! The pair would never have met but for them.
On Buffy, I liked S6 better in reruns/DVD than I did in its broadcast run, where a long (early-November to February) hiatus made the storyline seem to drag. I did hate the muddle that S7 became, with shifting premises and exhausted characters. I also think that 'Chosen' should have been two hours all by itself. JW said he wanted to avoid the overdone MASH-like finale, but the comparison was invalid. Even with SMG and others pushing, Whedon still had fundamental control over the storyline. MASH had long since fallen to the actors' whims. What he wanted to avoid, he had already avoided. He short-changed his flagship show's ending for a lesson improperly drawn from what was otherwise a milestone ending.
I do wonder how much S7 was short-changed overall by the three-way split between BTVS, Angel and Firefly.