im L50 i have 17k life in pvp i have 300+ expertise. Operatives/smugglers **** me in a stun or 2.
The only way i have found to beat them is either break the stun / pop defensive before i get re-cc'ed by them (cos they have 3-4 different onces).
The majority of the time tho if i can't break the CC i get ***** and owned in the face by 4.5k chain hits/crits whatever they are i die to them rediciously easy if i start beating them most of the time they vanish run away and open on me again in a couple seconds.
Class is a better assassin than a assassin is. They even get a nice junk-o-armorpen which assassins don't get so we do 500 dmg to those tanks while ops do 4.5k.