Game of thrones. They should have ended it when they caught up to the books. Just leave it unfinished. That’s not satisfying but better than what we got.

Big bang theory. It was absolute garbage.

Westworld should have just been an amazing miniseries.

Enterprise needed one more season.

Seriously folks - there can be only one and done:

HEROES

Save the cheerleader, save the world and then please - go home. But nooooo../

How I met your mother. They saw a cash cow and milked it.

Big Bang theory. It was kinda ok at first, but then it was just bad.

Scrubs.

I understand that they were trying to create a spinoff. But to continue with the same name and then teasing us with the previous main characters just destroyed what was the perfect series ending.

I'm sure most people here would agree that cancelling Game of Thrones once they ran out of source material and waiting for the books to be done (lol) would have been preferable to what we got.

GoT would have exited the cultural zeitgeist a lot sooner than it did, probably to the detriment of future viewer engagement and thus a source of revenue for HBO, which is why they pushed it forward, but still...

Supernatural

They managed to escalate all the way to God's grumpy sister.

And then went even further, making the next enemy: The British.

The Simpsons is still going.

It hasn't been good for over a decade or more at this point.

Westworld. First season was perfect and it concluded perfectly fine.

The Office. Last couple seasons were garbo

cue downvotes from the “still watches The Office on loop” crowd

House of Cards went on far, far too long. Should've ended at or shortly after he became President.

The definitive answer is Supernatural. Shambled on for another 10 seasons as the reanimated husk of a really good that was written to end after season 5.

Dexter

1. The Office (US) could have ended at the proposal in the rain.
2. The Office should have ended at the wedding in Niagara.
3. Dear god why didn't The Office end when Michael left?

Simpsons. Hasn’t been great since Season 12. Maybe glimpses in a few later seasons. But it’s now running on 35 years. Most of the original voices have left as have long gone all the good writers. The remaining can’t voice characters outside their ethnicity. And the show. Just “fart jokes.”

Probably the most brilliant show for a dozen seasons. Now just a husk.

Every single reality show that went longer than the first commercial break.

Whoever birthed the genre lived too long.

Star Trek discovery, should have ended after the intro

Game of thrones. Just pretend last 2 seasons don’t exist and you’re good.

Once Upon a Time. They felt like they had to just introduce a new Disney character at every turn and that they all had to be somehow related to one of the other characters. They also had a chance to tie things off by having Regina fall in love but nope, had to drop an A-Bomb on that possibility. Can't have a happy Evil Queen can we?

Scrubs: one of the best medical shows ever made. The last season was just a waste of everyone's time.

Frasier: After Niles and Daphney got together the writers were stalling the inevitable end.

The Son: Two seasons was two too many. Who TF thought it was a good idea to have Pierce Brosnan play a Texan?

Dexter.

As a Futurama fan...Futurama. The reboot is very mediocre at best, the show was great when it was a bunch of characters with wildly different personalities messing around in the year 3000. The first reboot was kinda less interesting but ok for the most part, I personally think the movies were pretty bad and the new season just wants to be South Park with 3-year old dated references. It had a good run, should've ended after season 4

Ended way too soon:

• Invader Zim (there were plans for 7 seasons, but Nick said it was "too expensive")

• Jimmy Neutron (again, f*ck you Nickelodeon)

• Inside Job

• The Misadventures of Flapjack (i mean, it's length was ok, but i'm salty about it's rushed ending).

Went on for too long:

• Stranger Things (looking back, only S1 was good)

• Rick & Morty (it was pure filler from S3 onwards)

• The Simpsons (should have ended with the movie)

• Spongebob Squarepants (also should have ended with it's 1st movie)

• The Fairly Oddparents (i share the common thought that the show ended in "Channel Surfers", but there were a few good episodes afterwards).

• Regular Show (mainly about Mordo's disasterous love life, everything else was fine, and the ending brought me manly tears :')

Weeds should have ended at the burning of Agrestic.

The Walking Dead for sure. I couldn't make it through the second season.

Supernatural. Imo season 5 was a great ending and a nice bittersweet way to end the series, instead they just kept going and the plot got too convoluted and I stopped caring. Might rewatch at some point, but idk if I'll watch past season 5

Rugrats after they added Dil. He was dead weight and the show went from the babies going on adventures to the babies taking care of a baby.

Lost.

Very glad I don't see anyone badmouthing the later seasons of Community. S4 was meh, but S5 and 6 are top-tier. I wish Elroy and Frankie had more episodes.

Lost - seriously fuck that show Prison Break Heroes The Walking Dead Dexter

Are the first to spring to mind…

The Simpsons

Honestly? Stargate SG1. One of my favorite shows.

The whole theme of the first seven or so seasons was teching up and gathering allies to say "you're not my real dad/god" to the evil sufficiently advanced aliens.

But then having reached the end of that arc and wanting to keep the show going, they introduced some even more godly evil aliens who weren't just sufficiently advanced but were actual magic. I felt it deflated the point made in the whole first arc, that there ain't nobody better then you, to then trot out some evil canonically supernatural entities.