Bah. Sion was pathetic at the end. It's almost like he has mood swings seeing as one minute he hates Kreia and wants her to die, and the next he becomes her apprentice again.
Nihilus was sweet because is high affinity to the force and his whole hunger deal.
Traya sucked. Bottom line.
Revan was awesome. I liked Revan's Sith look more than I like Vader's. I think Revan has the most interesting story of the other Sith Lords.
But I have to go with *coughmyselfcough*