I don't hate Zoro, if i were Oda he would be fighting King and then alongside all the strawhats he would have fought Kaido and cut him like Oden did.
I'm saying that when Oda gives so much focus to a strawhat, that character usually does something different and Oda explores his emotions and his past. We have a faceless Ringo daimyo, that seems to have Zoro's silhouette, the revenge against Orochi and the Nidai Kitetsu. Three pivot points, perfect to make Zoro's storyline.
Don't worry, he is still cutting Kaido a bit more.
If Oda really focused entirely on Zoro's background and Orochi, Zoro fans would burn their volumes