^ Warlock as a whole seems really boring and uninspired in Cataclysm. In PvE they seem well balanced, but in PvP they require some love.
Affliction needs much, much more single target damage. A full row of DoTs with Haunt and Demon Soul deals around 40k damage, while pretty mcuh every other class can deal such damage in 2/3 gcd's. So either nerf down everyone to Affli's level or buff Affli's single target by increasing DoT damage by 20/30% but increasing Soul Swap CD to like 30/40 sec.
Destruction needs a total overhaul as Incinerates deal less damage than Disc's Mind Spike. It also depends on Immolate too much which has absolutely zero dispell protection. Destro also deals pathetic ammount of damage while trained.
Demonology needs an instant nuke other than Fel Flames. Demo is just too hard-cast dependant and it's nothing but a flawed mechanic in Cataclysm as everything seem to have 666 gap closers. And as i've said earlier- Hand of Gul'Dan needs to be either Shadow or Fire, not both. Getting locked out of any magic of 8 seconds is no fun.