Why is elemental shamman useless on Icecrown server?

Hello,
I have one question. Why is elemental shamman nerfed on Icecrown server?
He is the lowest DPS of all classes and nobody want him in HC ICC raids (pug will invite everyone, it doesnt count)

Every class in BIS gear can go over 19K DPS. Ele shamman cant go over 15k DPS.

I have many experience with this class and i have to say that he must be nerfed or somethink. His DMG should be higher.
It cause low population of ele shammans on Icecrown. Server is full of mages, paladins, shadow priests and warriors.

Developers, why u made shammans useless?

Thank you for answer.