1. Northend is voiced to me than the Outland. The new continent is bleak, graphically gigantic and beautiful. Northend itself has for me personally much more atmosphere as the continent has some of the old classic WoW fler.
2. The instances are designed beautiful. The atmosphere is there vollstens on, captivates one and can no longer be so easy to get rid. In addition, instances were now designed friendly for casual gamers. They are short and sweet (max. 1 Stune with a sensible group).
3. The quests have become more beautiful. Of course, the typical quests like "Kill xx of which" and "Collect xx of which" still going strong, still hat Blizzard come up with much new can which makes questing more varied. (Eg: Sit in the Girokopter and get the approaching enemies from the sky)
4. New skills in talent trees and new capabilities round off the whole. These enable a whole new way of playing.
5. The death knight, the highlight for me of addons. Powerful, gritty warrior of both hands out good in melee, but well deal also with spells white. Especially since it does not charge anger or draws its strength from the energy, but uses the rune magic, which he performs powerful blows and spells.
A truly outstanding new class, so it is worth the addon if only because this one point. (The initial quest series from DK is especially 1a)
All in all for me a wonderful addon what vollstens met my expectations and Bc.