Why is Maul such a mediocre force user?
He has no good showings of barrier, can't use force lightning, has no knowledge of Sith Sorcery, no good showings of weather manipulation, can't use tutaminus. Did Sidious train him only to be an assassin and a thug with a Lightsaber? Does Maul have a handicap that only enables him to be good with a saber? Why does Maul have hardly any variety with his force feats?