The obvious skill is Dexterity of course.
You need it to qualify for your weapons, and unless you get a bow that deals magic damage, your regular attack damage depend on that stat.
There's also almost no way to get past archers without taking ranged damage, so you'll need the armor boost, too.
I play a ranger myself, and I have to say I'm dependant on a lot of stats.
I require Dex for the reasons above.
Intelligence for Magic armour, since as an archer, you'll be giving the mages a shot at you.
Vitality is pretty much essential for all characters, but you don't need it quite as much as a warrior would.
Spirit is less important, but you'll find that with the great array of special attacks (Explosive arrows, Split arrows, Way of the ranger, etc.) you'll need some mana, too. Keep that in mind.
The only stat you can really afford to dump is Strength. Just try to keep your enemies away from you, and you'll be fine.
So Dex>Int=Vit>Spirit>Strength is my stat priority.
