Is a good technique to set a villain as memorable, and well, villainous. You either set the hero as someone capable, and then show the adversary isn't only equally capable, but even more; or you set up a scenario where the heroes have to face the consequences of the villain acts; or made the act perform an act of evilness against some well established and liked character.
As quick examples: Luke trains to use the force. We know Darth Vader is more skilled than him. And then, holy shit, this old mummy that never stands up his chair is even more skilled than all of them and can shoot lightnings out of his hands.
As for the second, remember the 300 film? Yeah, they show a devastated town and all the farmers nailed to a tree. Whoever did that is evil, plainly evil, and we eventually learn about them, the immortal, the elite army of Xerxes.
And finally, we have D'vorah. I don't need to explain a lot about her, except to mention something: this technique can easily backfire. If the character isn't good on his own terms, meaning having good motivations, flaws and goals, then people won't like him, nor as character or as villain. And the acceptance of the work can greatly suffer because of it.