It's often easy to separate the good anime from the bad even before they air. However, these three shows had potential but failed to live up to it.
While it's expected that anime heroes should eventually overcome their villainous counterparts, some villains are just too powerful or clever.
There is a lot of potential with anime prequels, but they can also rob the main series of its mystique or make it more confusing.
While Rick and Morty are skilled at problem-solving, they might be in a real pickle if they visit the worlds of anime and characters like Goku.
Some anime series are so sad that they are hard enough to watch the first time, making a rewatch next to impossible.