>>537759534
People will point at this skill and the ammo and say it's bad, but really it only takes MGs 5sec to empty 300 ammo because they shoot 60 times per sec so she technically activates her last bullet effect even faster than Helm does because Helm has 6 ammo and it takes 1sec to full charge so it's 6sec total.
The real reason last bullet skills are bad on MGs is that they have a really long reload time and wind up after the reload so the optimal way to play MGs is to increase their ammo as much as possible and run the Bastion cube, which obviously has anti-synergy with last bullet skills because they shoot longer before emptying their ammo.
This could be fixed quite easily though by simply giving Aria a really fast reload speed similar to Exia's treasure S1 making her the first MG that doesn't need ammo. That still wouldn't fix that 7% crit rate is a nothingburger, but they could just increase it and add something else alongside it and it'd be a good skill.