I am barbarian and i don’t recommand it to you to go for it if your objective is PvP.
As said above, you need barbarian C3 to unlock full potential, and it have less synergy with Corsair than One-hand Spear/dagger Hoplite.
Your best way in PvP should be to run around with shield & tons of HP, untill you grap something with your hook, weapon swap, and burst it with Dragoon skills.
With this objective, Finestra crit rate, Spear Lunge +% pierce damages will help you more than few AoE.
Edit: It’s another question if you plan to go for Doppel instead of Dragoon.
If barbarian get kTOS buffs, then Hook > Cleave (+50 crit, +50% slash dmgs) > Cyclone should do the work.