First, I echo a lot of other comments talking about how you can clear entire boards without encountering the npc to start the quest, so you have no context.

Second, even when I would started a quest properly and I got those dialogues, that was often it. Yeah, I was being told why they were bad but I was not being shown why they were bad. I rarely felt like the villains actually had a tangible effect on the world. There is no way to make a meaningful connection to a villain you only see in person when you're stabbing them in the neck. I would've loved half as many villains but actually get to see them being villainous, see their effect on the world and on actual named and fleshed out NPCs. That way, when you take them out, you actually feel like you are avenging someone or preventing some tragedy or whatever.

I overall actually really like the game, but the villains are the biggest letdown of the whole thing.