In regards to the whole 7 shots point blank in the face to kill them.....
That's exactly how it should be. Remember this is an RPG so when you hit some one, regardless of where, your taking away from their total HP.
Why should my 9mm suddenly do 20x it's normal damage just because someone just got closer to me? Having a system which your describing would completely null gun stats in favor of realism. This is not something that fits in a game like Fallout.
Now what could be(perhaps) an appropriate solution is a perk or simply just a new blanket feature to the game where if you hit someone in the face that's not wearing a helmet your c chance of landing acrit shot or something like that(damage multiplier) would be raised.
EDIT:
archery is an iffy subject IMO. Yea it might be cool or whatever but it's functionality definitely comes into question. Sure when dealing with lower level enemies in sure i it would be a damn fine killing machine, but what about the guy whose wearing ANY type of armor? Your arrows would simply bounce right off of him.
Now there are surely a good deal of enemies who aren't very well protected - IE: fiends, raiders, junkies, just about all mutated animals(I'm guessing super mutants skin is extremely tough, comparable to rhinos skin perhaps....arrows wouldn't do much but piss em off). So I guess there would be enough enemy types to make it a viable weapon but I still think the devs would need to approach it very carefully.
The design(s) of it would need to have the Fallout feel to it, the different types of arrows, and how to classify which skill it should be in. I don't think it's worthy of its own skill but perhaps it could be placed in a new skill with a few other, kind of similar weapons. Perhaps stealthy types of weapons. Throwing knives, poisons(that actually work/that you want to use), that sweet wire that you use in the Hitman series to silently choke out your victims.
Maybe I'm taking it too far but I guess I can see where these types of weapons would have a place in the game.