If Saitama wants to be the greatest hero and receive all the love and admiration that comes with it, he must first defeat an enemy that he can not defeat with a single punch.

This is going to be a boring read, and I really wouldn't be surprised if this has been said before, but the thing holding Saitama back is bureaucracy. I imagine the bureaucracy of the hero association is just a story telling device. If Saitama was adequately ranked and he was called when a high ranking class S hero was needed, the show wouldn't really have conflict. It seems the show is more than comfortable saying that the hero association wanted their heros to be as smart as they are strong and Saitama did not score highly on his written test and they didnt have an adequate way to measuring his physical strength and their incompetence put him at class c. But I think the bureaucracy could present and interesting problem for Saitama.

What if the ranking system was flawed because outside forces and it wasn't just incompetence alone. What if companies used class s heros for marketing products and those companies kicked some funds back to the hero association to keep them at their rank... or something like that. This would create a problem that Saitama couldn't just throw a fist at because you cant be a hero while beating up everyone's favorite toy company CEO.

That might not make for a good story though. This is a show were we want to see good fights. What do you guys think?