At some point we have to decide that everything is relative and Kai, Vella, Evie, Fiona and Lann all have at least one very good weapon. Is Karok supposed to be anything more than possibly above average in that scenario?
If you're lag-less and pretty good at timing your attacks you can pretty much stay in the boss's face FOREVER, meaning that he has kind of Vella's ability to do constant DPS, but at a much much slower rate. Other than that, I don't see much else that helps Karok out, other than his Cestus buffs.