The marauder/sentinel DoTs ignore armor which is useful when taking down a tank.
The force kick interrupt stops a skill for 4 seconds and if specced correctly has a 6 sec. cd which can stop most healers.
The class also has 4 defensive skills each running at a 1-2minute cd each and last for a long time.
Why are you comparing the classes by the average dps, this class requires someone who is willing to adapt and change their style to better fit a team.