hi
here is some feedback about thorn barb (and other)
before begining, thorn is not overpower at all. What you see with @ROG one shoting a pit 100 boss with thorn is a bug. i struggle to pass pit 60 with thorn because of lot of thing like the very low drop rate of ancestral (impossible to have a ancestral razorplate). i switch to another build (mighty throw) to pass pit 60
Thorn always struggles with single target even with the key passive. Make the shadow boss of the pit interact with thorn.
Thorn does not work with ramaladni and twister can benefit from the ramaladni. why 
? I think you can make the thorn scale with the ramaladni.
barb is a meley unit not a range unit. We have to run away every time a shadow boss appear in the pit (to not have those crazy debuff) compare to the range class (like rogue and sorc) that shoot the boss miles away. make us shoot hard to compensate.
in the vendor put a button sell every thing as in the forge.
make the drop rate of the ancestral higer and maybe the drop rate of the GA affix rarer (i think). but like in the ptr, it is not good. I dont know why you want to nerf the game. And please, stop making the ptr harder than the release game, i am sur that you knew no one will be happy.
the mythic shatered vow is not good for barb. at the hight endgame we will never have DOT damage higher than the remaining life. Dont forget you nerfed the gushing wood
There is no viable way to gain offering with a channeling skill
rune that give offering when evoke another class skill doesnt work for me (i dont know how rogue was doing in his video. i try the daning ball of druid (i think) but it doesnt work.