If you get into a gun fight and got shot you lose health and it does not regenerate back to 100%
So if you 85% health that's what you take into the next gun fight. Now there is more info that should make you a better player
So you can quit wondering why you lose all those battles after your screen clears.
Your health comes back slower than it did in past versions of the game. It will regen but at a much slower rate.
You can kill two guys at once but the bullet damage will not go away as fast as it did in other COD games
All of these people crying about dying. It makes sense to have a slower regen that way that camper you got shots on won't have full health