Please fill me in. What is adds, cc and aggro?
Adds = any enemies that are not the boss or any enemies that are not the gold star
CC = Crowd Control. In your case, as a Sniper, you can only slice Droid enemies
Aggro = aggression. This is when enemies attack you. If enemies are peeling off the tank and attacking you, you need to use your skill 'Countermeasures' to drop your aggro; you may even need to stop DPS'ing for a few seconds.