I just couldn't do any kind of dmg to him. My 1M crits were not even hitting for 10K. So I put his profile in D3UP to look at WTF I was going against.
A 4.8M EHP barb pre-buff. 6,346,545 with WarCry. Threatening Shout put it up to 7,933,182. Crushing Advance put it up to 14,103,435 and for the winner Ignore Pain put it to Infinity. That is right. Mind you he is also regening at over 4000+ a sec and that will be getting doubled in 1.08 with the Inspiring Presence buff.
This doesn't even include Relentless kicking in at below 20% HP.
I eventually just had to give up. Even though he was slow as hell and I was doing a good job evading his hits. Eventually the battle just took to long and he got a couple crits in a row.
Even if gold wasn't an issue it would be difficult for a WD to sustain dmg that long and keep mana up.