Why are people underestimating Bandon so much?
-He could create force maelstorms around his opponents.
-He could insert fear (illusions) into opponents making them lose their minds.
-He was proficient in the art of force resistance.
-He was also proficient at force drain and force slow.
-He was the second most powerful Sith Lord in an empire renowned against fighting the Jedi in their prime, and the empire itself comparable to the likes of Palpatine.
-He is said to have a "score" of Jedi kills under his belt.