Agreed. My ranger (level 3) has just killed 2 skeleton archers (both level 3), one explosive bomber (level 3) and heavily damaged one skeleton warrior by shooting just one arrow spray (admittedly the bomber exploded so some of the damage might be due to the fire - but still it seems a bit overpowered). The AP costs for arrow spray is 4 AP which is the same as for a normal bow shot but the damage done is much higher.
