Basically, you have a skill called "power-draw" and each bow has a "power-draw" rating on it too.
Your power draw skill affects how quickly and how accurate the bow and even how much of a punch can get, based on the bow's accuracy rating and power-draw rating.
The accuracy rating is basically the maximum possible accuracy that you can get on the bow.
The power-draw rating is how much your power-draw skill should be in order to be able to use it properly.
For example:
-I have a power-draw skill of 10
-I buy a bow a very expensive bow with:
-15 power-draw requirement
-95/100 accuracy
-20 damage
-1 second draw time
I won't be able to use the bow very well since it's power-draw requirement is quite a bit higher than mine. I won't be able to use the bow to its potential. Which means that the bow will be:
-Innacurate
-Less power than the actual potential damage
-Take longer to draw
AKA
-60/100 accuracy
-10 damage
-1.5 second draw time
I then go buy another, slightly cheaper bow with less skill requirements:
-10 power-draw requirement
-75/100 accuracy
-15 damage
-1 second draw time
Now, the penalty for power draw is removed. I am now able to achieve much more accuracy (maybe around 70/100) and around 13 damage. Better than the slightly more expensive bow with better stats.
For balance though, having a power draw skill higher than 50% of the original will max out the stats, so they can't go higher than the stats in the description. So having 100 power-draw and 15 power-draw will not be any different when using the 10 power-draw bow. This is to avoid cheaper bows being better than legendary bows because you exceed the power draw skill so much.
However, if I have a 15 power draw skill, and I pick up the same cheap bow with a power draw of 10, I will be able to reach 15 damage and 80/100 accuracy. This is because my power draw is higher than the recommended.
Still, the previous, 15 power draw skill requirement bow is better because:
-Even with the slight penalties of being exactly at the power draw requirement, it retains better stats than the cheaper bow.
-90/100 accuracy
-17 damage
-1.2 second draw time
I dunno, I think it would be a really cool addition. The formulas for it could probably go in an arctan sort of way, increasing slower as value gets higher, but never reaching infinity.
Also, there can probably be very expensive bows with low power-draw rating and decent stats, but those would be for the extremely rich people, but usually, the higher the bow's stats, the higher your power-draw would have to be.
EDIT:
I think that arrows should be a multiplier to the bow damage or vice versa. I also think they should have an armor penetration % rating so that they can ignore some armor and deal more true damage.
It would be cool, since you could have armor-piercing arrows with less damage multiplication, but more armor penetration % so that they can deal more damage to a heavily armored guard than a normal arrow, but would deal less damage to a boar.
Having armor penetration would be better than a set number, because then armor-piercing rounds can fulfill their duty since damage reduction is reduced, allowing the base damage to shine through the armor.
TL;DR Go buy M&B and try the archery, then read this. And I do realize it is kind of late in the development cycle, but anyway.