the thing is that duelist generally know what to do better in 1v1 situations more than any other player. due to this they also know the best ways to use their class in a 1v1 as well. now if you put them up against a team that can't do 1v1s and they are able to get them into that situation the duelists will generally win. becuase if you can't win constantly in fights your going to end up losing regardless.