Shadows/assassins get SPRINT, aoe knockback, taunts, RANGED stun, sustained damage, and a finisher! Operatives/Scoundrels have NONE of these, and get nothing in return. They've just got stealth, a MELEE stun, an aoe mez that gives everyone 800 resolve, and higher initial burst (for the next 2 days). Not to mention shadows/assassins have WAY better defensive cooldowns even while dps specced.