The Simpsons started its life as an animated sketch on The Tracey Ullman Show in the 1980s. When it became a full-fledged series, it was clear why it worked so well: There was better writing!
Supergirl is much lighter than Arrow, and it benefits the series. The storylines are more engaging and less difficult to get through.
This is a controversial choice, but Legacies managed to expand The Vampire Diaries universe in a way that the two shows that came before it couldn't. It's all thanks to the magic school and the different creatures that cause problems on a weekly basis.
Legends of Tomorrow
The beauty of Legends of Tomorrow is that the characters have a spaceship that allows them to travel to new destinations every episode. It doesn't slow down for one moment.
Xena: Warrior Princess
As a spinoff of Hercules: The Legendary Journeys, all eyes were on Xena to see if could stand the test of time. It became one of the highest-rated syndicated series in the world and only concluded when Kevin Sorbo decided against renewing his contract.
Law & Order: SVU
The Law & Order franchise is one of the most successful in the world, but Law & Order: SVU is the only series in the franchise that is still on the air. The cases and characters are much more engrossing than those of the other shows.