If it was luke versus Anakin in Episode III luke would still win. I have no idea how vader won in empire strikes back if you think the anakin of the prequels is in the suit.

I mean starting with Jedi Vader became a pussy. He also gets owned by Dooku in Episode II when he was anakin and when he is vader in episode III by kenobi. He cuts obi wan down in episode IV only because ben lets him to create a distraction so our heroes can escape. He even gets owned in the force unleashed by Starkiller.

You're forgetting about the Jedi he was shown slaying in lightsaber combat during Order 66 in ROTS.