Ok, so she isn't actually bad. She does, however, have a stupidly long skill like a JK cramming for an entrance exam, most of which is largely irrelevant because all you care about is her damage output.

Which I guess is kind of alright.

Her skill has a good initial cooldown, and she's actually better than most ARs, but she won't usurp the position of the top ARs. A good pick for your B-team.

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.

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.

No, she's not a video tape. One of her skins shows her recent arrival in the US has apparently given her quite the dump truck ass. Must be all the McDonalds. Her skill powers her up with extra stats relative to the enemies she's fighting, meaning she has basically no real use vs. mooks. Potentially handy vs. bosses, but being a RoF-focused AR, she suffers from chips existing.