If you play a 5x shaman group, heroics got way easier in 3.0 thanks to thunderstorm...makes any trash pulls that were previously tough very, very easy as you have 5 knockbacks to play with you can nuke through the most insane pulls without ever taking damage. Now, If you play with a pally tank, im not sure if thunderstorm would be as useful sense your trying to tank stuff though im sure its still nice to have