The Steyr ACR is the gun the Pallet Rifles in EVA are based off of, and this one is about as useful. On one hand, it seems like she'd be good for para fairy and its debuffs (you get +25% final damage with that), except it isn't enough to make up for the debuffs still. It's also not very easy to get debuffed. Evaluation may change based on future enemies, but really it's not worth it when you have so many good ARs to choose from.

Can she dethrone AS Val's ridiculously solidified position as a top-tier damage dealer? ...Not really. She suffers from wanting some base crit rate, but making use of her crit rate requires either targets with shit evasion to begin with, a ridiculously high hit rate modifier somehow, or some other means of hitting targets at night. She might have some uses, but she's harder to use than AS Val, and you don't get much in exchange for it.