There are a few problems with the Barrage special. At the moment it's actually strictly worse as a multiattack with enough arrows against group enemies.
Since it doesn't take the archery training damage bonus into account, which is at that point at least 3. So with 4 arrows you're already even. And it's way cheaper as well, with 20 Stamina against 60.
For the late game, while it does take elemental arrow damage bonus into account. It doesn't multiply them like doing individual attacks would. Shooting 4 arrows means you get the elemental bonus 4 times. Using Barrage only gives it one time.
As another small thing, could we add the enemy specific perk damage bonus to the range attacks? Feral hunter, Demon hunter and Heroism. They fit thematically very well.