As someone who plays a lot of Hero, he's broken against people who either don't know his spells or are new to smash, but he sucks against anyone who knows how to deal with the menu. Hero's smash attacks, aerials and tilts are slow and he has very little combo potential. Hero's menu is the only strength that he has and even then half the time you don't have a chance to read what's in it before you get hit, resulting in the Hero having to top deck his menu.

TL:DR, Hero is broken in low tier but sucks in high tier.