Spirit Weapons SPVP??
I could give you a build, but honestly, no spirit build is “viable” in the sense that it’s good. Just passable. Guardians have all the same issues minion master has right now, with pets being super weak to AoE, but with the added disadvantage that pets have a maximum duration and Guardians are pretty utility dependent.
Warlord Sikari (80 Scrapper)
I’ve tried it out a bit, but it just doesn’t work very well. The mechanics surrounding them are pretty flawed. You can’t rely on Spirit Weapons to win a fight, they just aren’t good enough.
I find Spirit Weapons to be very fun and flavorful, but they’re just not good enough. 30 into Zeal is a must for Wrathful Spirits.
Maybe a build like that could work: http://gw2skills.net/editor/?fVAQNAR7dlsApIoVBxcI8DRh8Qldd0ivoNVPBBwDgDA-TpQSgAA7PAWGAA
GS/Scepter+Focus is a common DPS setup. Use Focus 5, bind them with Scepter 3, hit them with both SW commands, WW on top of them, drop the symbol etc. The burst should be insane if you can land it, quite possibly the biggest Guardian can muster, so there’s that at least.
Improved Virtues will help you last a bit longer and deal with conditions and CC, since you lack the meditations. The third utility skill can be anything, but I’d put either JI for full DPS and easier burst combos or CoP for a bit more survivability. You can even try some cheesy stuff with Sanctuary, so you can hide in it while your SWs do the work. Or you may go with Bane Signet for stunlocks with GS 5+Hammer command.
All in all, some fun stuff, but you will get crushed by immortal cele condi and AoE spamming gods.