User blog comment:Kaido King of the Beasts/Chapter 814: Mewl Like a Kitty, Bite Like a Viper/@comment-1595565-20160128190547/@comment-26087493-20160129073212

I'd say that Zoro isn't necessarily dumb, he's just a very simple kind of man. He enjoys training, he enjoys drinking, he enjoys eating & he enjoys sleeping. Well, and fighting. But other than that, Zoro lives a pretty uneventful life. Because of this, he always tends to come off as the most "normal" of the Mugiwaras, but more than often he's the voice of reason, even if he ends up acting like the Dutch Uncle of the Straw Hat Family. When you break it down, the dumbest things Zoro does are things like GETTING LOST ALL THE TIME,  not thinking things through (usually because he's in the heat of battle,) and because he's just generally lazy most of the time.