All TV shows have a shelf life โ nothing good can go on forever!
Marvel
Most shows get worse as they go on. Except Avatar: The Last Airbender, of course.
Usually, this decrease in quality is slow. But sometimes, something happens that is so ridiculous or badly done that it pushes a show past the point of no return. This is called "jumping the shark."
ABC
I believe Lost is the former (slow decline), but correct me if you think a specific moment stood out!
Like on Pretty Little Liars, when the girls were arrested for Mona's murder, kidnapped and put in an underground dollhouse, then discovered Mona was actually alive.
Freeform
Honestly, I loved this plotline, but it was pretty wild.
I know some people thought bringing Michael back from the dead was too much even for a telenovela like Jane the Virgin.
The CW
Why kill him in the first place then??
...Or that having Felicity redirect a nuclear weapon to kill tens of thousands rather than hundreds of thousands (and then it sort of being brushed off) was way too far on Arrow.

The CW
How was this NOT a world-altering event in the Arrow-verse??
Maybe the levitating babies in the Season 3 premiere of Riverdale were so ridiculous, they caused you to never watch the show again.
The CW
I really wouldn't blame you. Between them and the Gargoyle King, Season 3 really went off the rails.