vader wanted luke at his side to overthrow the emperor because he wanted to rule the galaxy. he didnt want to kill him because he was evil. the only reason he didnt kill luke in esb is because he wanted him alive to be his pupil. when he said that there was no conflict within him he was actually telling the truth and didnt have any trace of good in him until the end of rotj. according to lucas vader was completely immersed in the dark side and the ways of the sith up until rotj. just because he knew that what he was doing was wrong didnt mean he didnt want to do it vaders responsible for the murder of thousands and kills his own soldiers if they displease him as seen in esb. hes definitely a villain.
He may not be the #1 villain in the saga, but he is still a bad guy. He had a change of hearts in the end but that doesn't take away from all the evil shit he did before.
You want to parade all over Sidious's dick go to his respect thread.
I always loved him. His voice. How he chokes people or force chokes. His breathing. And especially his qoutes:
"It would be honored if you would join us."
The timeless = "I am your father!"
my favorite = "I find your lack of faith disturbing"
I can't name em all. there's so much.