Mighty Morphin Power Rangers first came to be as a television series. Comics based on it came later. The show was what introduced the characters and the story to the audience initially.
It's about a huge, multiverse - spanning adventure of the Power Rangers. There are different Ranger teams coming together to face a powerful threat that endangers all of their realities.
The Morphin Power Rangers story might not be good because it doesn't engage the audience enough. Maybe the villains are not menacing enough or the themes are too simplistic.
It depends. Sometimes stories labeled as 'Shattered' can be based on real events, but not always. It could be a fictional tale inspired by real-life situations or completely made up.