You're not doing it right. No you won't be able to kill a sorcerer if he's got a pin head behind him healing him while he's healing himself. That's the absurdity of allowing heals in a war zone, but all PVP should be a team effort anyways. If a sorcerer runs away bubbled then you won the fight in my opinion. Either hunt him down or chalk it up and prep yourself for the next fight.
Classes in this game are for the most part nicely balanced. Some are better counters than others but overall every class can take another class down if timed right and the situation falls in your favor.
Except for operatives. Stun locking is the epitome of lame. There's no contest involved and junk like that should never make it past the theory crafting stage.