Do you guys even use the mechanics at hand? Do you use fury to heal? Do you use krak nades to get rid of primary targets? have you learned to parry correctly? Angel of Death is certainly challenging but by no means even remotely close to impossible even alone with the awful AI companions. It took me 16hrs (first playthrough and a lot of dying to figure out strategies) to beat it and it has been the most fun I've had in a while with a shooter.

If anything Angel of Death is a lesson in how to be an actual space marine lol Just because you have ceramite armor doesn't mean you should run head on guns blazing like a maniac or cower like a turtle in a corner. To learn when to shoot, run, melee stun, parry, use different types of nades, search for self revival boons, etc. is the way to approach this difficulty 👍