You have eight basic attributes: Intelligence, Dexterity, Valor, Armor, Strength, Wisdom, Endurance and Toughness. Intelligence gives you Spell Power, Spell Crit and increases your maximum Mana, if you're into that sort of Mana-based dps thing. If you're more of a healer than a fighter, you'll want to look for Wisdom. That provides healing Spell Crit and Mana Regeneration. Endurance and Armor are similar in that Endurance provides a bigger Health pool, allowing you to take more damage before you die. Armor reduces the amount of damage that gets through to you, allowing you to stand and fight for a longer period of time.
Focus and Hit are similar to each other in that Focus reduces your target's chance to resist your spells while Hit reduces the chance that your target can avoid your physical damage. Short answer: melee needs Hit, while casters will want Focus.
Melee dps will also want Attack Power and Physical Crit, both of which are provided by boosting your Strength. Strength will also provide some Block and Parry, making it, along with the Toughness attribute which reduces your chance to be critically hit, a primary Tanking stat. Melee users who are not tanking will probably want to invest in Dexterity more than Strength, as that provides some Physical Crit along with Dodge and Parry.
Finally, there's Valor, the PvP attribute. This only reduces the chance of incoming critical strikes, so you will still need all other stats required for you to function in PvE. Valor just helps to keep you from taking a huge Crit to the face from a member of the opposing faction.