The only exception is Breaking Bad. Disclaimer: Spoilers ahead!

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After major characters like Christina Yang left the show, the interest began to diminish, and the later seasons were seen as a weight dragging the show down. 

And don't even get me started on Stefan and Caroline—it felt heavily forced and did not do much for the plot (I would have much preferred that she ended up with Klaus, but a girl can dream). This series would have been impeccable if they had ended it with the main villains as the Mikaelsons in season four or five. 

And finally, when the main cast departed after the season six finale (Charming, Snow, Emma Swan, Henry Mills, Zelena, and Belle), it really took away the charm of the show. This would have been a stellar show if it ended either at season five or season six. 

Seven seasons for such a show was obviously way too long. Riverdale would have been the perfect indie series if it had stopped at season two. 

What got fans most frustrated, however, was the final season. Season nine almost entirely focused on Barney and Robin's wedding weekend, making it slow and repetitive. The mother appeared very late and had incredibly limited screen time. And to make matters worse, Ted's character development was entirely undone by one move: making him go back to Robin after she gets divorced and the mother dies years later. 

Viewers were left thinking, "All of this mystery and delayed reveal for Ted to go back to Robin—seriously?" We could have appreciated the show if it ended in four seasons, with more screen time for the mother. 

The final reveal of the villain was a major letdown. The show revealed Alex Drake, Spencer's secret twin sister, as the villain and it didn't sit right with the viewers. The character was never properly introduced before, and the "evil twin" trope was perceived as lazy. This show could have ended within four seasons. 

The main criticism from fans was regarding the final season. The final villain was not very memorable, and it felt very rushed. Fans were disappointed with the execution of the last season.

The show began as a gripping crime drama, but fans believed that the show would have maintained the same intensity had it ended after season four or five.

The bland and lazy reveal of Dan as "Gossip Girl" absolutely left fans enraged, as there were multiple plot holes in this narrative, and it was a letdown to this build-up.

It was a stylish teen drama; however, the chaos got out of control, and the show's quality declined. The show would have done well in four seasons. 

The final season absolutely divided the fanbase, with Dean dying, Sam living his life, and the two brothers reuniting in heaven years later (sound a bit familiar?). Some appreciated this wholesome conclusion, but others stated that the show should have ended much earlier with both characters surviving. 

So yes, this show should have stopped at five seasons. 

Fans were disappointed due to several unprecedented changes in character arcs, such as Luke hiding his secret daughter from Lorelai, Lorelai and Christopher's marriage, and Lane getting pregnant immediately after getting married to Zack. People also found it particularly problematic that Jackson lied to Sookie about his vasectomy, and Sookie getting pregnant despite her desire not to have more children. These changes in dynamics changed how fans viewed this beloved series. 

Many felt that the show should have ended one season earlier while maintaining the same wholesome tone of the show and the characters.