Luke is not a Mary-Sue, he's a whiny little *****
Yoda is not a Mary-Sue, he's a senile old man
Obi-wan is not a Mary-Sue, he's the sacrificed mentor
Mace Windu is not a Mary-Sue, he gets blown out a window by the villain
And lets be really honest here, being the bad guy stops being cool once you get past puberty, you "Sith Lords" may need more victims but i suggest you get them while you can cause we all know the end of the story, You Lose