Sharpshooter + volley is only "okay" damage by level 11.
You already get 2 attacks so if you need to 2 guys, you can do it already. So Volley is only worthwhile if you somehow get 3or more guys in its small area. So a ranger would not be doing AOE every round unless they set up the enemy.
The real problem is the level you get it ranger stuff.
At level 11, most foes are fat with HP and ranger AOE anyjust tickles them. Most threats have more that 50 HP and a danger AOE does not break their stride for the squishy back row out of fear. Fighters can do 3 attack burstdown, barbarias have raging reckless attack with brutality. Paladins can burn slots for good damage while buffed. Rangers get AOE for stuff that shouldn't scare them or a 2nd attack for their squishy pet.