It's interesting that you say this while I'm reading the latest star wars novel series, 'Legacy of the Force' - or something similar. It deals predominantly with showing the Sith from a new point of view - not as bad guys, but as those who would master their emotions and use their full power to bring order to the universe. Darth banned member and Emperor Palpatine, which were the sith in the movies, are described as the sith who failed to master their emotions, and let their emotions control them, thereby becoming selfish and causing great pain.