I prefer Feral Instinct over Thick Hide...so you can get atleast an easy opener. Rest of the specc seems to be pretty solid. But with all the delay issues feral pvp will be pretty tough without quick shapeshifting. It's so annoying =(
The spec makes little sense imo. You go thick hide over feral aggression which is the main dps talent for cat druids. So it seems like you will mainly go bear in PVP then you spec into blood frenzy that only helps cats. I am confused. PS. How is powershifting working in PvP?
Thick hide increases the armor in all forms, even humanoid. So it helps with survivability overall. And even more armor when in bear form if one need to take alot of hits, which happens pretty often in pvp. And a druid is best played in pvp when all forms is used. Staying in cat form too long is pretty risky depending on who one is up against.