Power wise, Kaido and Big Mom were both an extreme disappointment, Big Job moreso of course but both of their fights looked like high tier battles, and even post Wano Lucci is invalidating Kaido’s feats already.
Story wise, I don’t think I’ve ever seen worse villains in any series ever, Kaido and Big Mom were both gag villains who did not feel like threats, and both of their big fights were complete garbage. All of Luffy’s East Blue fights are objectively better fights than Luffy vs Kaido.