the "toxic scan" ability, which the op class gets, removes 2 negative effects from you.
toxic scan + vanish = move away from the fight like a boss.
toxic scan only removes tech dots and since most people who complain are force users its still a valid response.
A commando/mercenary if played well can chase away scoundrels/ops pretty easily. Vanguards/powertechs again played well can survive againts them just fine.