Spartan Warrior a great off-tank, bringing incredible utility to the group with Phalanx providing damage mitigation, Valor providing group healing, and Charge taunting, reducing the movement and attack speed of units around its target.

Attribute points should be spent in approximately a 5 Strength : 2 Agility ratio initially to build attack speed. Once you have ~200 base Agility you can devote all your remaining attribute points into Strength exclusively. 

Once you have 400 Agility / Attack Speed, you can now focus on a more specific build:
Tank
3498 Strength

The current meta on a Spartan Warrior is the full-strength build. This build gets enough Agility from items alone and does not need any attribute points be spent on Agility at max level.

At max level, the core setup is                            , combined with your Olympian Relic;

1.      Immortal Armor of Hepheastus - This Relic offers survivability, mana regeneration and spell power. Easily the best choice to pull you through the difficult fights. This is the only meaningful option for this build as it relies on the static mana regeneration.

Hybrid

49981 HP

With the Hybrid build you still have enough HP to survive crits, and enough regeneration from Vivid Regeneration to continue tanking.
This build brings a bit more flexibility to the meta build, and improves the AoE damage from your active abilities, but reduces your over-all single target damage.

At max level, the core setup is                            , combined with your choice of Olympian Relic;

1.      Immortal Armor of Hepheastus - This Relic offers survivability, mana regeneration and spell power. Easily the best choice to pull you through the difficult fights.

2.      Searing Flame of Prometheus - Searing Flame provides the best damage output but sacrifices survivability

3.      Thundering Hammer of Zeus - Hammer of Zeus is another option for a more support-orientated build

4.     Towering Shield of Athena - Incredible damage mitigation with a little bit of extra damage from the Strength, AoE armor buff, and a on-use effect to fully heal and replenish the mana of yourself, and all nearby players. Extremely useful for when the healer is OOM!

Intellect

24981 HP or lower

This build should not attempt to tank

This build is strictly for AoE damage and support through the use of the Spartan Warrior's active abilities

There is a lot of room for variation in this build and I would encourage you to experiment with a range of support orientated items such as Shimmering Lance      , Frozen Ring of the Ice Queen      

At max level, the core setup is                            /      , combined with your choice of Olympian Relic;

1.      Immortal Armor of Hepheastus - This Relic offers survivability, mana regeneration and spell power. Easily the best choice to pull you through the difficult fights.

2.      Searing Flame of Prometheus - Searing Flame provides the best damage output but sacrifices survivability

3.      Thundering Hammer of Zeus - Hammer of Zeus is another option for a more support-orientated build

4.     Towering Shield of Athena - Incredible damage mitigation with a little bit of extra damage from the Strength, AoE armor buff, and a on-use effect to fully heal and replenish the mana of yourself, and all nearby players. Extremely useful for when the healer is OOM!

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For your familiar skills, you want to invest in the 5% Health buff from Aptitude for the Tank build, and the 5% Spell Power buff from Aptitude for the Caster and Hybrid build, along with your preference of 75 Strength/Agility/Intelligence from Gift of Endurance/Dexterity/Wisdom, to achieve the Agility and Strength breakpoints above.

>>Blanket Disclaimer: You, and every other player will need items from all crafting professions so there is no 'best' profession for any given class. If you are selfishly looking for personal enhancements, Alchemy is the only profession whereby you can't bring items you crafted through to another game, so this might be the best choice on a personal level, but increases dependency on others for crafting<<