I really think Blizz made a mistake in how they changed leveling in live. Its not fun and doesnt feel rewarding at all. Plus you can choose what expac to level in but you dont get to experience a quarter of it before you are at the level to start TWW. I love going through all the expacs while leveling. I love the balance in MoP where the leveling is still a real experience and not just a chore to shoot you to end game but at the same time its not an overly brutal grind. Live WoW is only good for M+ for me but Im having a blast leveling in the MoP pre patch. It just feels rewarding for the time and effort you put into it.