Yeah, I don't think Oda means to paint Oden as a bad person, but to show us how impulsive and thoughtless he is. He spent his entire youth doing whatever he wanted -- in a way he had "affluenza" not unlike Doffy or other spoiled people who grew up doing whatever they wanted. He just gets whims and does whatever he wants, like taking over brothels and whatnot. Then he joined WB on a whim, abandoned that when he heard Toki, then joined Roger because "hey why not?" and acted like a dick to his retainers just because he's kind of selfish and impulsive. Now he's attacking Orochi all wild as hell jumping out of windows and not listening to people who told him to stop and listen.
So either that impulsivity is going to be the reason he gets killed, or Oda is going to give him a moment of realization and he'll sacrifice himself.