Listen, I'm studying creative writing, lets get that out of the way now. I am author, so I believe I know what I am saying. You generally have two kinds of action type books or manga. One where the main character is super powerful, and one where the main character is super weak. An example of a strong hero would be Bleach, or Naruto. It's harder to come by a weak hero book. But it isn't shitty writing to have the side characters be weak compared to the protagonist. In fact, if done right, it can be great. That's how the real world works, if you are strong and others are weak, you are strong and others are weak. There is no denying that. Typically books won't be read from the point of view of a side character. The strong character will be the center of attention. About the whole skill thing, the hero can't exactly be in all places at once, other things must be done when they aren't around. You need to have other characters to show some sort of power scale. The main character shouldn't be able to do all things, but sometimes they just can. It is part of their abilities. I have a strong main character, he dwarfs other beings, at this point in my story, he cannot be beaten and he is stronger than the god that created the world. If you have incredibly strong side characters, there can be a good story, but it won't be the same story. We all love Naruto here. Just imagine how shitty it would be if he was a weakling. Madara would wipe the floor with everyone. Just remember, strong side characters can undermine the message of the story, you have to think about the theme. Nobody likes a story with no real story. With everyone about equal power, you just have a flat road of a story. Not the rollercoaster brought on by differences in power.
