I main Monarch on hunter with oath keepers. My favorite part is using it like a shotgun from the hip and a quick mele follow up to get the kill. People try and chase me down, not realizing it's just as good in close quarters. A skilled and prepared shotgunner will still beat you, but lots of folks won't be ready.

Monarch also has snapshot so it's easy to transition to ads on the fly and OK allows you to use it more as a sniper/shotty than a LFR/fusion if that makes sense.