re: Is yoda a Sith Lord or does he just contradict himself?

I am more concerned about how the Sith are always kicking the Jedi's arse. Watch Clone Wars... Sith/Apprentice always win or get away when facing multiple Jedi. One Sith Lord was single handedly responsible for the destruction of thousands of Jedi. Hell, most of the bounty hunters on the show kick their asses. Case in point Cad Bane. Faces Obi Wan and that Voss guy and battles them to stalemate then escapes. The Jedi are weak.