Lets See, We got...
STR: Damage
DEX: Hit Chance
WIS: Heals (Spells?)
Off Tanking / Solo
STA: Health
AGI: Damage Mitigation
So From What I can tell you only really need 3 stats if your in a group Providing Support/Damage. Though if you want to solo or maybe off tank (Situational), then i can see the other stats being important. Might be something I am missing about agility though.
I plan on being a Dwarf... which would be a lot better if we had crossbows, but ill take the bow and march forward like the abomination I will be!