Aetheric Burst has little effect on someone bursting you which is typically what is happening in a 1v1 skirmish. Also it requires the target to pretty much be within melee range to hit them with and if they that close to you as smn you are in extreme danger if the opponent is a tank or melee. Summoners do use it but it's not so useful when the opponent is blowing all their off gcd on you obviously.
