A bow a viable weapon?
Yes, for sure! If you search nicely, you could find (enough) bows with good high damage value, even in the beginning of the game! But naturally, you must put enough points in Dexerity to use greater bows!
BUT I combine a bow always with Mage-skills and some Melee weapons for close combat too!
Further on I put the most stat-points in Strength and Intelligence and try to find charms for Vitality and Spirit or find gear with these stats.
So for close combat I use the swords or axes I find! Only I buy early in the game the best bow I can find and I buy nothing or maybe a good two-handed sword if I can't find one soon!
The skill I put immediately 2 points in is
Ranger Stealth, some of my favorite skills and I always focus on passiv skills

. But Ranger Stealth is very handy, not only for a Ranger, but also for a Mage-type! Drawing a bow with this passive skill I can focus from more afar an enemy and on that moment I can choose to shoot arrows (and using Poison Arrows if possible) AND/OR I can choose to use spells!! If the enemies are a few levels stronger, I shoot and than go running backwards and most of the time just 1 enemy comes closer! So I can kill him with magic and a bow and finish with a melee weapon, using Wirlwind if necessary!
Other skills I have are (from memory, don't sure I write them all down here the one I have):
Magic Blast(2), Destruction(2), Confusion(1), Fireball(2), Mana Efficency(2), Potion Efficency(1), Ranger Strength (1 from gear), Poison Arrows (begin as a Ranger), Explosive Arrows(1), Evade( from gear), Wisdom (from gear), Stun Arrows (from gear), Lockpick, ...
Some gear with a skillpoint I switch between them, according to the situation!
I always search for the best equipment and hope I can find good enchantments and charms!
On "high" difficulty (for my 3e play) it is not easy, but it is fun, a challenge and I will absolutely try it to the end! So I will never change the difficulty later on!!
I use my Creature (not always, but often) and try to give it the best legs, arms, body, head, etc I can find! Maybe later on I try a the skill to summon a Demon, but not sure.
I try to find the weak spots of all kind of enemies, but not so simple to find!
Killing Amdusias was not easy! I kill him with a good two-handed sword and magic: so I run fast to him so he take his sword and not his bow with explosive arrows!!
Killing almost all enemies in Brocken Valley and do almost all Quests there.
If you have more questions, ask