Mage just can't outdo the hunter even w/ CC which will most likely be trinketed. Shammys could 1v1 hunter in the long run, but it will be 2v1 shortly enough. As for lock/shammy v hunter/shammy I'm gonna assume that the shammy can focus cast wind shear or simply tremor totem the locks fears. IMO hunter/shammy will pull ahead and the lock will die too quick for the other shammy too heal him under windshears (unless he's the king of fake casting, but if your that pro and know your class so well it will inevitably turn the tide of most fights). It'd still be a good fight.
Post epic 2v2 vid as evidence please.