Dexterity improves ranged weapon chance to hit, perception improves crit chance and overrall sight distance, he wont need con if he doesnt put himself in harms way to begin with ( and all toons get additional hit points every time they level up anyway), for Rogues I build Dex, Spd, Per, Con in that order he ( Wolgraff ) usually is fast dextrous and perceptive but weak and stupid. My Rogue is my Ranger since Rogue abilities and Ranger abilities are actually mutually complimentary.

Sneak 5 or 6 doesnt usually fail, and is good for guerrilla, I just prefer a stand up fight, and so rarely boost sneak up to the level where it is really great, I dont backstab and I dont let my squishies get close, why get close when you can shoot em in the face?

What else?