This isn't really Oda's fail, he wants them to be like that. We're talking about a guy who:
1) Turned one of Arlong's commanders into the transport tool and other into a weird kisser.
2) Had an eccentric okama as Crocodile's second strongest subordinate.
3) Drew a whole scene about one of Lucci's top subordinates laughing his ass off at his coleague alongside Zoro and Usopp because of his devil fruit, plus the whole Usopp-sword scene, the "oh, it's Usopp" gag with Kaku, Jabra's fear of devil fruits, etc.
4) Do I need to describe Moria's subordinates?
King and Queen are pretty much like Bonez and Bentham. One is serious, impassive, pretty much made to fight with no deeper implication in the plot (let's see if King does, well, something) and the other is eccentric and more entertaining to carry subplots. But Queen is still crazy as hell (his game with the ice ogres is quite menacing) and King is described as a sadist who tried to cut Sanji in half.
I don't know, I find them to be consistent with what Oda has always done.