Sadly you will be disapointed on both counts Chuxsta.
Damage causes the screen to get darker and mistier until you find cover then you recover. I loved the old way where you limped round

As for door, it is either opened or closed. You do now have a snake cam though with which you can peer under doors and 'tag' 2 enemies for primary target adn secondary target for the AI squadmates to take out.
Also you can still choose the likes of "Frag and Clear" or "Flash and Clear" etc and the severity depends on what mode they are in, recon or attack resulting in the likes of Frag and clear, Breach and clear, storm or Flash, smoke etc for recon.
It all works really really well mate but I do miss being able to open the doors a crack and peer into room

Oh and as for shooting through doors, I thimk so9me guns do but best of all, shotguns can blow doors completely apart which is great for scaring the begeezus out of enemies on the other side of the door
