http://wotlk.wowhead.com/?talent=f0ebRrZMhqbbVx0bGRidAo
The only reason I think it's somewhat viable is the fact that you get access to "Stay of Execution", 30% reduced duration of stuns, deadly throw (a chance to use better dps PvE gloves instead of the pvp ones), and most importantly, prey on the weak and murder spree.
Think of this in a 2v2 situation, against, say, a warrior/druid (actually any team). Get them separated more than 10 yards apart, or perhaps, they're not standing next to each other from the very beginning. Whoever you open up on, they are already below your health percentage wise, and they're stunned from kidney shot. As soon as you throw your kidney shot on them, activate murder spree. 25% increased crit damage, 5 assaults with both weapons every half a second, and they can't do anything about it. Even if they trinket you will still be attacking them.
All melee attacks would have a 10% chance to daze the target, so if RNG is on your side, you can get away, restealth (or vanish) before the other player can do anything to you. Ideally the target would be dead.