I'm 100+ spvp games in on WB, here are my thoughts and suggestions. Although I haven't read all 27 pages, I'll try my best not to repeat what others have said. Everything mentioned here is based on pvp.
None of the utility skills are worth taking. Reversal of Fortune is not dependable, for some reason, it just won't proc, even if you're in the middle of a team fight. Landing all 5 attacks of Flash Combo is rare, if the opponent is walking in any direction besides towards you or is standing still, they will easily avoid it. Whirling Light is my favorite skill visually, but the damage is equal to 3 auto attacks on greatsword, the skill description says "Lunge forward" but I don't see any increase in movement speed. Roiling Light does what is supposed to, the only suggestion I have is to decrease the cooldown if Quick Retribution lands. Heel Crack is just a boring skill, doesn't feel good when you land it, please add some visual effects to it. Heaven's Palm seems like it was supposed to work similarly to the sword 2 Dragon's Maw combo (before the patch), but isn't the purpose of the spec to get multiple hits in, why would you want to knock more people away, also the 1.25 second cast time means anyone with high movement speed(trait modifiers, runes, or superspeed) will just walk away from it before it lands.
The WB trait line is fine, decent modifiers and boons. The only trait I think needs a serious change is Deathless Courage. The use case is so narrow I don't think anyone has fully used it yet. Even if you get a kill while it's active the duration is extended for 1 second, what is 1 more second going to do? I would really like to see a trait that buffs the Physical skills, similar Monk's Focus and Weighty Terms. The new virtues significantly decrease the utility of passive virtue modifier traits, limiting build diversity, but many people have already complained about that.
Rushing Justice lands a large percentage of the time and does good damage. Flowing Resolve works well as an extra evade frame but the healing isn't there, requiring 5 attacks to get 652 healing is not worth it, one auto-attack or condi from the enemy will negate that. Crashing Courage is great as an initiator, but the long channel time leaves you vulnerable if it's being used as an escape.
Sword offhand is meh. Executioner's Calling was hyped up as the big damage skill, but torch 4 and focus 4 do roughly the same amount of damage and are easier to land. Advancing Strike is fine. I rarely took sword offhand because the damage wasn't there and having another dash just seemed pointless. There isn't any good reason to take sword offhand over the other options.
Visually the spec is underwhelming. The only visually impressive skills are Whirling Light, Heaven's Palm, (which aren't worth taking) and Crashing Courage. It hurts seeing all these new specs with flashy new abilities and guardian is just the same. Plus all the dashes look the same, there are mobs in Path of Fire that have better looking dashes.
I can't really judge the playstyle since I didn't take any of the WB utilities or the new weapon majority of the time. I played it like a medi core guard, but medi core is better because of the extra trait line, virtue passives, and instant cast virtues. But I don't see any other viable options to play WB in pvp.
TL;DR
Traits Good. Utilizes Bad. Virtues Good. Virtues interaction with core guard traits Bad. Offhand Sword Bad. Visuals Bad.
