OP? Is paladin's divine storm, usuable every 8 seconds and ripping people apart in hectic pvp situations OP? Is the boomkin, a plate wearing caster OP? How about a rogue that dances thru the shadows and one hits casters? Or taking down a DK (finally) only to have him come back as a ghoul and finishing you off?

My point is there are plenty of spells that have  been considered OP, but blizzard isnt dumb, they have balanced their game fine, so dont worry about it.

  I was playing my shaman in Arathi Basin, and I've had two incidents that other shaman may want to watch out for.

1)  I was in the Lumber Mill and nearly dead, and out of mana, fighting an alliance feral druid.  Finally, my thunderstorm cooldown finished up and I used it on him and laughed my head off watching him flying off the edge...only to see him feral charge me and kill me while flying off the cliff (it looked pretty cool I admit)

2)  I was fighting a mage in arathi basin again on top of the lumber mill, I used thunderstorm again and he flew off the edge.  About 20 seconds later I see a warning saying that very same mage was attacking the Gold Mine. D=

I have a horrible story about this.
We were near the very end of AB, it was a very close game.
The only contested area was the lumbermill.
Capturing that would win either side the game.
Our force of about  10 allies goes charging up.
Theres one lone shammy.
He dies.
We cheer (Yay we win...)
He reincarnates.
He thunderstorms.
We all go falling off the cliff.
Shammy gains 10+ killing blows.
Horde wins.