Battlestar Galactica from the 00's. It was written as a 3 season show but was padded out by another season to exploit its popularity. As a consequence, season 3 is not good.
But seriously The Handmaid’s Tale about halfway through the third season it became too obvious they had no plan and started introducing things that contradicted things that had already happened
What's worse is that now I end up having it binged every now and then because my wife still likes even the later seasons. When you watch it like that, all the little issues show up more.
You know why that is? The goa'uld carried the show. Once they weren't the biggest threat anymore, there wasn't really anywhere to go. SG1 relied on Earth being the scrappy underdog on the verge of being wiped out. Each individual goa'uld could act as the big bad of the week, get defeated and you know that there'd be another one to take its place the next week. The goa'uld were simultaneously familiar, threatening and varied. Once they were out of the way, the replicators and ori got wiped out a good season or two after being introduced. They didn't have the staying power that the Goa'uld did. And worse, near the end of the series, when youve killed what are effectively gods, how do you create tension? Earth is basically an interstellar power, SG1 are essentially demigods and the biggest threats are effectively gone.
The good wife. It became a bit distant from early episodes and meandered a bit. New characters were good but it was odd having main cast not share scenes due to personal falling out.
Sex and the city. Started out topical and fresh. Became a melodrama. Now revived as a melodrama.
Downton Abbey. Good cast and stories but time jumps meant you kept losing plots, characters and subplots, so it fizzled out.
It's an interesting concept but it wears out fast when you realize most of the people on the show would either need help with their mental health, or should simply not drive at all.
It just shows that we have a bad health care system when it comes to mental health, and that we are dependent on cars on top of that.
Like, they had multiple people with severe anxiety issues that thought they should absoluuuuuutely drive a car no matter how dangerous they were. And unfortunately it's not like we could encourage those people to use the inexistant transit system where they lived.
So most of the seasons are the same with different people, eventually all returning to driving a car, even if some should definitely not.
And they called it 'rehab'. Ugh. They should have realized how cringe and immoral it all is after the first few seasons, not 14!