The attack with areas eliminates the "experience of to fight". Some guys launching areas and all die without being able to take the advantage of GW2's ability to "evade". It is usually impossible to evade the areas of "several Necro's".
Unfortunately, there are no more zergs clashes in which players can contribute to the battle.
Nerf or completely eliminate the areas ... or create a new instance: NvN (necro versus nercro).