Quite useful, but not great on her own. Her own DPS isn't especially impressive for an MG, but she can give a decent amount of extra ammo to other MGs, which can be worth it or not depending on who you pair her with, in addition to giving shotguns extra armor.

A gun so good Crozier doesn't want you to know about her! In-game and in real life, a straight upgrade from Chauchat.

Tiles like Negev and a skill that works somewhat similarly with better uptime make her useful in the same circumstances she is, and they work well together if you need ALL the armour stacking.

…Also the replacement cinnamon roll now that M4 turned full edgelord.