I was one of the numskulls that chose to take a hiatus during MoP since it did not seem appealing. Coming back in 6.1 there was so much I missed and for the first few months of returning I loved it so much, but as most people know content was too repetitive and garrisons, while a great idea, made the game far too simplistic in professions and gold gathering.
Now in Legion I can't wait for everything, I for one love change and of course every xpac has it. I want to see the new class halls, the artifacts, I can't wait for Xavius since even though he didn't have much appearance early on he wa