Dark side gets no dedicated tank (Chewbacca, Han Solo Stormtrooper) to taunt. On Hard Mode, NPCs that are 14+ levels below me cut through my characters easily.
Dark side gets no dedicated healer, or decent healer. Old Daka is too difficult to earn, and Talia kills herself in order to heal. Meanwhile Light Side earns a Consular easily, and has two other healers.