When classic if classic comes around you will realize WAIT A SECOND. sorcs can 1 shot people, Rangers can 2 shot people, Sins can 4 shot people in under 2 seconds.
This is has always been the nature of Aion and the best mechanic for this has always been to group up. This is why the meta changed from time to time from a blender comp> 3 mage groups in to 2 cleric 1 chanter groups in to 2 temp 2 cleric 2 cc classes.