You won't do the 250k dps the Elemental shaman is doing, but the elemental shaman on the other hand won't do the 100k dps you're doing outside of your burst. Bosses with burstfases aren't designed around every class doing 200k+ dps, neither are they designed that every class needs to do 100k+ dps outside of burstfases. I'm sure everyone would like to see their class dishing out sick amounts of damage once every 3 minutes, but that's a very childish approach to class balance.
In every classforums here players try to make a case where their class need to have high burst damage, high single target damage, high aoe damage, a battle ress, 4 different raidbuffs and a bloodlust in order to be viable. You are viable. Get over yourself.