Each stat is impartant to every class, and none should be sacrificed i will list here a little sample of what each stat does for the rogue and i will rank these in order of importance
STRENGTH: (3) Determines the Amount of damage done per hit and also helps to break through an opponents armor
AGILITY: (1) By far the mostimportant stat, it makes up for the lack of armor rogues can wear (leather is the max armor) it increases the Subtlety skill and all things related to it (sneak, vanish, pickpocket) 2 agi = 1 subtlety skill
STAMINA: (2) Increases the amount of health and energy the rogue has, (i believe it's every 1 STA=5 hp/energy)
INTELLEGENCE: (4) Not overly important but it help raise skills, all skills including crafts combat, everything
SPIRIT: (5) Not too sure about this, but I believe it improves the defense vs magic spells, AKA it determines your base magic defense (I play a troll, which has high stamina and I very rarely have to worry about spell dmg)