User blog comment:XD1/Adventure Dream Team Voting - Round 11/@comment-99.9.22.19-20121029185558

I think everyone is missing a logical point: having the Sith, Vader, or Voldemort on the team would undermine the entire quest. They would always try to take the ring for themselves, and would probably fight the others to claim it. The ensuing battle would prevent them from ever reaching Mordor. (Not to mention The Man in Black was the embodiment of evil--there's no way he'd let the Ring be destroyed.)