She has a very weird and complicated set of skill interactions for a role that really just wants good, consistent dakka. Has a funny combo skill with M82 (the bullpup AR, not the RF). In terms of performance she's actually not awful, but she doesn't stand out, and there are enough good ARs to use other than her.

There are not enough ways to say "use her if you have her." I want to make a joke, but its hard to overeemphasize just how good she is. Besides her immensely good uptime (5/8 type), it's raised even HIGHER by her passive, which triggers it everytime she switches targets. In most cases, she will pretty much outperform G11 handily.

Basically the best of the best among daylight ARs, and powerful even at night vs up to light armour. She wants the #7 position on your formation, and there's little reason not to give it. Also she has enough of an Acc Buff that everyone who used to do stupid shit to prop up SR3 can be quiet now, it's all the buff you need to run her.