Gameplay mechanics don't contribute to a person's said strength. Otherwise, the Secret Apprentice would be like the god of the SW universe. :P Especially b/c that's just what they are. Gameplay mechanics. They are just their to provide an RPG feel to the game. As for the Dark Jedi being able to shrug it off, I'd suppose they'd need to become resilient to it, considering the happy habit Malak had about using Force lightning on incompetent/unwilling-to-turn-to-the-Darkside Jedi. :P
Otherwise, I'd like to possess an insta-death saber that cuts people in pieces on contact like they do in the movies :P
A tale of souls and swords, eternally retold.