Here is my opinion on Landa. Unlike his other germans who hated the jews for the sake of hate, He did not. He saw his job as a game, something to do for fun and when the time was right he betrayed his own country to meet his own means. He was not controlled by emotion. IMO he was the best representation of true evil, emotionless evil. So I say Villain in the best since of the word.
I thought this was a return to form for QT. I loved Kill Bill, but this is a more considered approach to a film. A more Reservoir Dogs style talker of a film with interesting dialogue and characters interspersed with some shocking violence. My favourite parts were the "We will be cruel to the Germans" speech, any scene with Higlitz or Landa (man, that guy was loony even for a Nazi) and the bar scene.