Unplayable is a bit dramatic. My sorc was full heal speced before 1.2. I specced into a heal/lightning build after 1.2 and have done just fine, putting up decent healing and pleanty of damage. I agree survivability is a bit low, but if you want to live forever roll a tank and pay a pocket healer. Dieing is part of PVP, especially if the other team has marauders