DISCLAIMER: I haven't played a lock personally since early Cataclysm.
5 locks have always been pretty squishy. Furthermore, except for a specialized destruction build, they just don't have the burst to kill anyone protected by a healer (I chased a resto shammy once all the way from Tarren Mill to Southshore with 3 stacks of dots on him and he just dropped totems and healed through everything. And that was back when resto shams sucked.)
If your real question was "Are 5 locks faceroll in pvp?" The answer is no, and they never have been. They do shine in certain cases. Ebola's mid-air DoT kills were hilarious to watch. And classes that couldn't heal were pretty much dogmeat.
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