how about you comment on the quality of leveling, when you actually got to play through it, huh?
they actually said at blizzcon that there will be more max level content than ever before (timeless isle like - spread over draenor, not isolated only)
leveling feeling too long was a major complain in mop, so wouldnt you say its a logical move to tune it down a bit? blizz also said they are going to improve the leveling experience with dynamic events and more exploring stuff.
apart from that: wait till you get to experience WoD -> check if the amount of leveling feels right for you -> if not then go ahead and complain. thats the right order.
btw blizz cant do it right for every single one of their millions of customers.