Adam does not seem to be fond of quests in Vash'jir. He makes some valid points, but I have to say, most of the things he finds wrong, I actually find right. I guess we can't agree on everything, right?
The main reason I play World of Warcraft is because I love every bit of lore Blizzard has created, be it Warcraft, Diablo or Starcraft lore. However, while I do enjoy the lore behind most of the quests, I haven't found the gameplay required to complete it very engaging up until now. I enjoy mmo's because of the social aspect and the fact that other players are interacting with the same world I am in their own way, and I can actually witness that. When it comes to gameplay, however, I prefer the way most single player games handle it - story driven and "on-the-rails". While not perfectly, I feel that the new way quests are designed does this quite well. There are flaws, some of which Adam mentioned, and some of which I too agree with, but for the most part, I find it more engaging than it previously was. Those quests he mentioned where you basically do nothing, I see as cut scenes, which I love to watch in single player games.
Now, I haven't played through Vash'jir completely yet, but I have seen this in other zones, including some of the revamped vanilla zones and I think that it's an improvement. Not all the time, not everywhere, but for the most part, definitely.
TL;DR: I like the new leveling. It feels more engaging and story driven and I don't think it will get as dull as it used to when I go through it on my twentieth alt.