The new AOE top dog in my book after the nerfs kneecapped the [Kuva Zarr] and [Kuva Bramma]. The ammo economy on this is still fine, so this it is. Very good general purpose weapon, albeit with a somewhat painful reload time. Remember that it reloads while holstered, though, and if you pair it with 2x Synth mods on your companion it will reload-while-holstered faster than it actively reloads. (I think. I never actually did a formal test. But eyeballing it seems a tad faster.) And being able to 'partial reload' with a shorter amount of time spent is very useful, too. I recommend getting into the habit of popping a quick melee attack after you've finished firing at your targets so as to holster this weapon and start the reload. If you're willing to waste a mod slot on your secondary, you can even go 3x Synth for extra success.

[Vile Acceleration] is necessary if you're not getting some other kind of fire rate buff, otherwise the thing shoots too damn slow.

And of course feel free to swap Serration out for a Bane mod if you want to minmax, but I don't do that since it makes it much worse pre-Merciless stacks and managing Banes is a pain in the ass. (Plus I often pair this with Roar in which case the value of a Bane is marginalized.) Remember that the slash procs from Hunter Munition double-dip on faction damage bonuses, though, so these do gain extra value there (specifically ,+55% becomes +140% (from 1.55x to 2.40x)). And if you really wanna minmax you can drop [Vile Acceleration] for Arcane Acceration + Faction mod and get the best of both worlds, at the cost of a warframe arcane.

Side note: I see some builds omit [Primed Firestorm]. That is a bad idea. Do not omit [Primed Firestorm]. Bigger AoE is absolutely vital. Allows you to hit more enemies at once which means more damage, stretches out the damage falloff so enemies that would have taken damage anyway will take more damage, and just makes it a lot easier to aim. If you omitted [Primed Firestorm], you fell victim to one of the classic blunders.