The thing about Solo leveling that blew my mind was that the MC showed that he was powerful as HELL! which is much more advantageous in the environment he is in because everyone loves him and no one can fuck with him. The thing about most manga/hwa/hua is that the MC hides his strength for no reason and that leads so many boring and unnecessary problems. So I like that the author decided no to be lazy and make the MC op but always hiding his strength. In some manga/hwa/hua hiding your strength is advantageous but in most, it's not. Also, I like the fact that he didn't go full zero-hero and actually had many challenging quests and not to mention the fact he still isn't OP and has many enemies that can fuck him up. Furthermore, he's not OP for no reason if you read far enough you realize he is a monarch from a different world