I think he's probably the worst Antagonist in OP. Despite having a 10+ year worth of buildup for this showdown he's a massive disappointment and embarrassment. Luffy had a harder time trying to become YC level against Katakuri than he had trying to become Yonko level against Kaido.
Hell, even his ranking in the polls says more than enough.
Hell, even his ranking in the polls says more than enough.