I've always loved a WW Barb (even D2.) I primarily do Sc. If you are able to do level 60+ GRifts with this build or know about it, please give me your thoughts.
I started out using IK set with Furnace, but now that we can use powers from the cube I changed to Dual wielding Bul Kathos (to keep my fury up) each about 3,160 dam. I had Ancients out all the time and they took half my damage, but I only had 560k life. Well, I could still do T10 carefully, and barely do GRift 50.
Then I switched to Wastes set and my actual damage shot up and I could do GRift 55. My life was low though ( and I no longer had benefit of Ancients to mitigate damage received, but I had the 40% damage reduction with Wastes set) and I needed a ton of cooldown reduction stats on items and the Obsidian Ring of the Zodiac power to mostly stay in WotB, so my damage dipped a little.
To fix that I changed to full bonus of Wastes set and the 2nd tear (4 item) bonus of IK set, by using RoRG with IK Boulder Breaker as my weapon. Now I'm always in WotB and always have Ancients out.
I've not yet extensively tested it. So far T10 is an absolute breeze now, but higher GRifts I just can't kill fast enough. I stay alive even at say 63, but I'm slow at killing time-wise.
My Kanai cube powers: Furnace, Hexing Pants, and maybe Unity (I forget atm...)
Legendary Rings: Gogok of Swiftness, Bane of the Powerful and Bane of the Trapped.
relevant stats:
~9.5k str
950k life
56% CHC
500% CHD
40% Lightning Damage (I'm using Lightning damage on WW)
29% WW damage
~7k life per fury spent
to reach decent WW hit and tornado proc breakpoints I am at 2 APS with IK Boulder Breaker (when 15 stacks of increased speed from Gogok.)
My IK BB does 4,600 damage with emerald in the sockit.
Skills:

Suggestions?