What characterises/defines the role of a 'charismatic villain' in film?

Take Adolf Hitler for example. He was a motivational speaker and inspired a lot of people to follow him. Just for bad reasons to do awful things.

But the Third Reich was not a movie.

If we stay within the Third Reich there is Christoph Waltz - a German actor -playin the elite member of Hitler's SS in Nazi-occupied France, Hans Landa

I loved the part in the Third Reich when Hitler found out his pizza was going to be late.

Who can forget that scene where he orders the invasion of Poland because they put anchovies on his pizza??

I love the part where he attacks over-strict grammarians: "You guys are like some kind of grammar authorities or some, some kind of grammar... strict police... dammit! What's the word I'm looking for? I'm thinking of an authoritarian regime or something with the streets filled with like uniformed soldiers that arrest people for the slightest offence. It was on the tip of my tongue, god damn it. Well, you know what I mean."

A good place to start would be to look at Shakespeare's most loveable rogue Sir John Falstaff. He's a terrible person, but he's witty, irreverent and a bon vivant, all qualities that are admired, (in England at least.)