Power Guardian Spear / Greatsword GW2 Guardian WvW Builds
Guardian without an elite line is still a real WvW build. Zeal, Radiance and Virtues stack strike damage on a Greatsword, and the utility bar carries the things a squad actually asks a Guardian for: 
Wall of Reflection reflects projectiles, 
"Stand Your Ground!" breaks 
Stun and grants 
Stability to you and five allies, 
Renewed Focus makes you invulnerable while it recharges your virtues.
The damage is not free, and it is worth knowing what it hangs on. 
Fiery Wrath only adds strike damage against 
Burning foes. 
Unscathed Contender adds it while you hold 
Aegis, and again while you are above 90% health. 
Righteous Instincts and 
Retribution both key off 
Resolution, which your virtues supply. Every multiplier has a condition attached, and the build works because the virtues keep meeting them.
What you give up is the traps of Dragonhunter and the tomes of Firebrand. What you get is a melee Guardian with no extra mechanic to misplay: one build, power gear, and a bar you can press correctly on the first night.
1 Guardian build
Power Guardian Spear / Greatsword Playing Guardian in WvW
The mechanic is the three virtues, each with a passive that is always running and an active you spend. 
Virtue of Justice burns foes every few attacks; activate it and you and your allies burn on the next hit. 
Virtue of Resolve regenerates health passively and, on use, heals nearby allies and clears two conditions from you. 
Virtue of Courage grants Aegis periodically, and pressing it breaks Stun and hands aegis to nearby allies. Almost every trait line reads off that: 
Inspired Virtue makes activating a virtue apply 
Might, 
Regeneration and 
Protection to allies and pays you strike damage for each boon on you, 
Virtue of Resolution grants Resolution on every activation, 
Power of the Virtuous shortens their recharge.
So the build plays as a loop. Press virtues, hold the boons they give you, spend the damage multipliers those boons unlock, and use Renewed Focus to run the loop again — it breaks Stun, and it recharges your virtues, not your utility skills.
Where it struggles is reach and margin. Everything worth pressing is melee or near-melee range, and the power prefixes leave you thin, so a mistimed push means you are the one going down. There is no second mechanic to bail you out — once the virtues and Renewed Focus are spent, you are a body with a Greatsword.