Honestly the part you care about is the damage reduction and taunt, which can be useful depending on the type of enemy you're fighting. She wants very much to be the off-tank, in a classic ARSMG formation, and actually has decent tiles for it.

She is NOT for normal use due to her awful DPS, but the taunt can be useful vs certain enemies in the distance to keep them from interfering with the fight (for example, the new model Army tanks). The taunt can also affect random-target type enemy attacks.

For once, an SMG that does something different. Her skill at max reduces her damage taken per hit by 15, except since it ISNT armour, it cannot be penetrated by armour-ignoring effects (like explosions) or enemy AP. So, massive multi-hit effects kinda just get shrugged off. Also, unlike shotguns, as an SMG she can dodge, so you don't mind taking ticks of 5 damage here and there.

What makes her useful while shield SMGs exist is mainly the much faster ICD.