You can make the quick work of Bosses in Mass Effect 3, follow the simple steps below.

Around the time you start fighting the Brutes, start upgrading armour-destroying powers like Warp and Incinerate – particularly damage and cooldown time.

They chew through Armour (the yellow health bar you see on powerful foes).

Thats where most of the hit-points of boss enemies like Banshees and Ravagers are.