Between her two modes AND a passive that helps keep shotguns alive, I don't think there's much more to say other than "she's great, you will probably find a use for her."

Has the skill that makes M2HB so good (but with better numbers!), but with a little less attack in exchange for a non-garbage Accuracy score and having 16 max rounds (instead of 15) with a maxed gold ammo box, making her really good. Probably the best general purpose MG right now.

Has the same skill as M2HB (but with slightly better numbers) on a 4 star platform and farmable (in theory) from 0-2. Has a less shitty acc stat (but not by by much so you'll still want a +ACC item) but more importantly she has a 11 base ammo, that means you get 16 max shots to proc that skill with instead of 15. Pretty much the 4 star MG you'll want as of now. Also, the gun is Gunjesus Approved.

The Ma-deuce. Testament to the genius of John Moses Browning. Has an amazing passive that deals 240% damage every 4th hit. Highest stat out of all the MGs in attack, though lowest ACC as well, and can't reach 16 bullet belt, maxing out at 15 WITH the 5star ammo boxes so.... can't quite use her skill to it's full potential. Still, will last a long time and competes with 4 and 5 star MGs. MURRICAAAA.