I really liked the event.  Just like everyone else I thought Zone Pull + Double/Triple Loot Instance items were awesome.  I didn't think I would see these types of items as drops.

I really liked both the random essence drops and augment system.  I felt like I still made progress even when I had bad luck on the bosses.

The zone and diversity of mobs was great.

Overall this was a really good event and I spent a ton of time in it.  Really enjoyed it.

Thanks Akkadius and Rent

Orc Thundermaker - Any shaman
It use to be just stormbringer before the revamp.  Afterwards I've had him spawn from any of the shamans in the orc camp.  I think stormbringer will also spawn him but he has a shaman in his area so hard to tell.