This is pretty player dependant. You need to have a fast trigger finger (by fast I mean firing at the effin cyclic rate) while being able to maintain accuracy. Most people can't do that. It's the BEST gun in some peoples hands.
Could say the same for the chicom, best SMG in the game in the right players hands. Same RoF as the scorpion and the best recoil of any smg. Drops people in the blink of an eye with practically no burst delay.