What are examples of TV shows you that thought were amazing in the beginning and awful (https://tvtropes.org/pmwiki/pmwiki.php/SeasonalRot/LiveActionTV) by the end (https://tvtropes.org/pmwiki/pmwiki.php/Main/LaterInstallmentWeirdness) or maybe they got a bad start (https://tvtropes.org/pmwiki/pmwiki.php/EarlyInstallmentWeirdness/LiveActionTV) and were great (https://tvtropes.org/pmwiki/pmwiki.php/GrowingTheBeard/LiveActionTV) by the middle/end?

“Happy Days” was a funny and thoughtful show during its first two years on the air. As soon as producer Garry Marshall decided to film the show in front of a “live, studio audience” (read: a bunch of raucous, prepubescent teeny- boppers), THAT was exactly when “Happy Days” jumped-the-shark.

The beginning of Barney Miller was not so good. It got much better after they dropped Barney's wife/home scenes and fine-tuned other characters, specifically Wojo and Harris.

Cheers had a bit awful start before everything got quickly improved

Three’s Company were very awesome at first and they continue it until Season 8

Dennis the Menace was great but when Joesph Kearns passed it should of ended. Jay North was outgrowing his role.

Modern Family was great Up til Season 4 maybe Season 5 but than it should of ended.

The Goldbergs should end since Jeff Garlin & George Segal are gone.

Roseanne-The Conners should of ended when Roseanne was dismissed.

Newsradio. The Phil Phil stuff at the end soured it for me.

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Ones to watch... but only up to a certain point (https://whatculture.com/tv/10-tv-shows-that-sucked-after-the-first-season).

You know it, I know it, we all know it: sequels are a risk. If your original film was beloved, there’s a lot of pressure not to mess that up with where you take that franchise next.

The thing about TV shows though is that they require a lot more attention and time from an audience than a film. Your viewers aren't committing two hours to this story, they’re committing a dozen or more hours every season. With all the hype that can come out of a TV show, we’ve all had those experiences where we’ve tried our best to get through the second season hoping that it will live up to its groundwork. You’ve got to let it play out to know for sure.

We’ve also all had those experiences of going “oh no” when the credits roll on a season finale, as you know that a season of your once favorite TV show has let you down. Sometimes the studios see a big reduction in quality and act fast. Other times they just see the numbers and keep on going, even if the show has lost its way.

The following TV series also started with so much promise but, no matter how long they ran for - or are still running for, in some cases, they are so far removed from how they made you feel when they were fresh and new.