S!
Modelling damage in a game accurately is very hard without sacrificing performance. Damage boxes can be thin etc. but they are still boxes

In my opinion modelling damage and FM are the two most challenging things in a game.
As of what damage a bullet does. Due my work I've seen some test things of different ammo fired on a sheet of aluminum, thickness similar to aircraft skin. And after seeing that what 20mm or 30mm guns do I stopped worrying about IL2's very simplified damage model...go figure
So if you want realistic DM, then we would have SoW - Damage Done

If you want to fly, we got SoW - Laws of Aeromystique

You get the pic. You make valid points Stafro on the KE etc. but our poor PC's can't handle it.
Oleg has said in an interview, was it on SimHQ or elswhere has slipped my mind, that the DM in SoW is very complex but adjustable. How it will be we will see later this year I.