Also another common problem I've been faced with is the simple casting onto melee, you have your shamans in a group (close together normally) and some rogue / warrior / retri pala etc run up and into your group, you start casting and they run behind your guys - you can't mouse turn all of them instantly because your using keys. The cast fails, you start again and they jump behind you again, constantly wasting your casts - A decent melee group which isn't instantly afraid of you can cause all sorts of problems until you master how to counter react it.