Coerthas
Smoother transition of zones within zones (Turning Leaf, Sorrel Havens, Nine Ivies; Clearwater, Riversmeet, Providence Point) didn't require 3 keeps and ten thousand doodads each to feel unique.
World felt like a frontier rather than overbuilt.
More diverse mob behaviors.
The first time through Castrum Novum: https://www.youtube.com/watch?v=VGdz1gjQPrE
In either case though I wish endgame had more reason to go out into the world, though I'd generally prefer to go out into 1.0's than ARR's, and would have liked to see both worlds improved upon (rather than all resources funneled into closed instances).
