I definitely have to say, after playing 30 or so matches, that something seems off with the difficulty tuning--specifically enemy health. I have no problem with enemies being lethal, but when a black widow can't kill a shielded enemy with 3 headshots on silver, I don't know, seems like a bit much. Everything is just such a damage sponge, and enemy density seems much higher than me3 at the same time. Maybe things change as levels increase, but it seems that even higher tier guns are barely making a dent in most enemies, and biotic and other combos seem to hardly do any additional damage at all. What was appealing about biotic explosions in 3 was that when you set them up you could clear a room full of enemies in a second; here it seems like, maybe you get a bit of extra damage on the detonated target, and put a (small) dent in anything that is super, super close by. And would be shield stripping powers like overload and energy drain... take less than half of an 'weak' enemy's shield out on bronze.
Has anyone progressed far enough to indicate whether this changes substantially as you gear up?