[2019] Flame turret any good?

I swap from Assault to Flame if I have any weapons that deal bonus damage to on-fire targets or if I'm playing in a group.. Merphee has it right about knowledge of enemy spawns or bottlenecks being super important though.

Also, don't forget you can toggle on/off the fire with the ability button. It drains MUCH slower when it's not shooting. Also allows for more staggered bursts for when multiple waves of enemies spawn.

Hope this helps.