By skyforbes 
when talking about how strong the modern era actually was i think people don't talk about this scene enough, if sukuna is calling gojo "painfully ordinary" for matching him in multiple domain expansions and eventually tiring out, this means the heian era was filled with sorcerers that could do the same.
NO sorcerer of the modern era other than gojo could pull off a performance like this, they'd collapse on the first clash. of course gojo goes above and beyond and keeps fighting (this is the mid point of the fight after all) proving he's much better than every other heian sorcerer, but to think sukuna views ALL THAT as the bare mininum just shows how insane that era was.
edit: never mind! u/Frater_Shibe dismantled my case pretty well, he's not using "painfully ordinary" as a comparative term to other sorcerers, sukuna's using a buddhist term to call him an "unelightened one"or "ordinary man". he's reversing his title to call him overrated, basically.
it's possible he could still be meaning both ways but personallly i'm not committed to the agenda enough to claim that, for those who can, go off.