This is my POV of Vindicator in WvW. Some of my issues with Vindicator:
Greatsword:
#3 Phantom's Onslaught: it feels like it needed a finisher on it either whirl or leap and 12s instead of 15s or invade frame.
F2 Ability: it needs some more works. It feels terrible if you're not in Legendary Alliance Stance, very underwhelming for other Stances.
Energy Meld: This ability feels like core revenant mechanic (25 energy + a buff based on the legend), but it just gives you 50 endurance and nothing else.
Utility skills:
Normad's Advance: 900 range leap instead of 600 range
Urn of Saint Viktor: this skill feels terrible to use. It barely even heal, you can't be heal. The trade-off (50% MS, -50% condition damage/damge) aren't really worth using. Drop Urn of Saint Viktor: if you pop it above 75%, it doesn't do anything. You basically lost 25% of HP for nothing.
Traits:
Leviathan Strength: it feels like this should have been a based line thing for the Alliance Stance. Flip and refresh utility skills is a little pointless since they are on 10s CD. Plus, it increases the F2 CD to 40s, like why would you give up a dodge for a CD refresh when they are only 10s CD.
Redemption's Sermon and Balance in Discord: I tested with 1200 Healing power, it barely increase any healing, it's very disappointing.
Overall:
Assumed Power build: Alliance Stance synergies well with Assassin Stance since Riposting Shadows gives you 15 endurance. There is most no synergies with the other Stances(Jalis & Mallyx).
Assumed Healing/Support build: the combo of Ventari and Alliance stance is fun to use. They have some vigor and increase to allies synergy. In Salvation line, Selfless Amplification + Saint of Zu Heltzer could give you at least 40% increase to healing to allies. The issue I want to point out is with Ventari Stance, it have no stun-break. When you swap over to heal allies, you have no way to stun-break. I believe that Ventari and Alliance Stance would be a great healing spec in WvW.