When Orr was released, it was hard because there were so many tough enemies that deals tons of damage auto attacking you and they would literally swarm and chase you cross the entire map. In the new zones, the mobs deal massive damage only if you fail to avoid their special moves or cc them to stop their channeling. Also they are quiet slow, with speed boost signets you can out run their attacks.
Another thing to keep in mind is after you unlock all masteries, these mobs will be a joke because their poison will have minimal effect and they can’t stealth anymore.