Here it is...
There are all kinds of different ways you can play your ranger. You can be a sniper with high stealth and bow and nothing into melee and low path.. Or you can be a melee ranger, everything into piercing or blades, Celtic duel, and path split as even as you like. Or you can be something that I find pretty cool.
You can max spec bow, medium stealth, medium celtic duel, medium path and low pierce or blades I choose pierce because I am a lurk.
You still have a the dmg of a sniper but with not as much hiding. But see rangers suck at hitting mobs with daggers and they suck at hitting red and purple cons for the most part. I have found that raising celtic duel really does count. It makes you hit twice in one ratio. The more you put into cd the more you hit with both the offhander and main at the same time. All putting points into pierce or blades does is raise minimum damage so don't worry about it so much because we get great dmg spells that give us more damage everytime we hit a mob.
So if you have a good CD and a nice damage spell then even if you do hit minimum damage almost everytime with you daggers or swords the dmg spell will hit the mob also. So if you can duel wield good you can hit the mob for more than twice the damage of a person with a CD.