The story of one punch man doesn't have to be great but simple is i rated it about 7 but everything else excels with a 10.
This is the kinda show, that is a slapstick of every super hero in marvel and DC but the main one they reference is superman outfit and the abnormal ability some spoilers.
Saitama is a normal human who wanted to bring justice and become a hero for fun and for other reason compared to other superheros. He is simple thinks of himself as a normal human being an example is his disciple ish Genos says can you fly he said he just a normal human. This show does not have any limits because it senien not shouen so it doesn't have limitation for languages or art.
Lastly if you love OP funny az fuck character with awesome production watch this because its simplicity is just amazing and also its fights scene even have better production than fate stay unlimited blade works if it comes to action, it has the best animation and fight scenes out every anime that existed no jokes if i am wrong tell me about it but anyways, people who love action,comedy, shouen ish , orginallity watch this please u won't regret it.