Primary

 Intelligence
 Strength
 Agility

Damage

 Physical Damage
 Elemental Damage
 Melee Damage
 Ranged Damage
 Fire Damage
 Ice Damage
 Light Damage
 Critical Damage
 Armor Penetration

Defensive

 Health
 Mana
 Armor
 Resistance
 Dodge
 Tenacity
 Life Steal
 Mana Steal
 Spell Vamp

Miscellaneous

 Move Speed
 Attack Speed
 Projectile Speed
 Cast Rate
 Jump Force
 Range
 Melee Range

Physical Damage

Physical Damage is the form of damage dealt by most weapons. All Physical Damage is caused by either  Melee Damage or  Ranged Damage. Physical Damage is the preferred form of damage for the Warrior, Hunter, and Rogue.

Physical Damage caused by basic attacks benefits from  Life Steal and  Mana Steal. Physical Damage is countered by  Armor, which in turn is countered by  Armor Penetration.