Archer/Bard has got to be the strongest sustained DPS in the game because everything can be cast on the move. Positioning hardly matters to them, whereas all the melee classes have to run in and out of red circles all fight and casters have to stand still, risking damage from wayward red circles. Archers/Bard can run around freely mashing on their skills every time its up with little regard to the monster. As long as they are not standing in the red circles, they are constantly applying damage.