Ah, the "fake underdog" story. It pretends the MC is somehow given a bad hand in life because he supposedly has no talent and people hate him, but only as a way to establish the entirety of the cast as strawmen jerks the the MC will eventually put in their place when the MC turns out to be absurdly overpowered and show how badass he really is (his harem who always believed in him excluded, of course).
I have the same issue... I don't hate power systems or anything, but just don't get invested in them since the story never follows them and always breaks their rules for the sake of plot: in action shounens the MC will just ignore any limitation or consequence through willpower or friendship speeches, will achieve with "special training" in a lunchbreak skills that everybody takes years, and whenever they are in disadvantge they will just evolve midfight and end up winning due to tenacity or something; in Light Novels and such the MC will likely have this special unique skill that trivializes the entire system, flat out be good at everything, or if they are bad, they will just happen to develop a different skill and still unique skill that is a complete anti-meta strategy, pretty much giving him an unfair advantage.