Sith Marauders were fueled by hatred, rage, and cruelty; the Marauders would fill themselves with rage when entering a battle, entering a battle-fury fueled by the dark side. Thus, most Sith Marauders could duel any average Jedi, toe-to-toe, and win easily. Marauders cared little for the subtleties of manipulating others and lacked a deep understanding of the Force.
Right, DLots approved it allready, but here are the middle class stats, you can ask the master marauder to add you to the group.
-jump 3
-push 2
-pull 1
-sense 2
-speed 2
-rage 3
-lightning 1
-drain 2
-grip 1
-saber attack 3
-saber defense 3
-saber throw 1
I do not think they need changing, those are the abbilities of the marauder, and the drain2 is for a chance to heal up.