Daunting I agree with but I don't think it should be so difficult as to turn people off from wanting to experience more. A difficult levelling path won't miraculously make great players - you're going to get people that are PL'd, barely scraped by or just generally awful regardless of how hard the levelling path was, the only difference is that it will take them a bit longer to cap D:
I understand what you mean about gaining knowledge through experience, but why can't you get that experience on the same character? You're still having to level the job ; ;. I played WoW for a little bit (got dragged into it by a friend) and getting a mount didn't help me learn how to conserve mana in a raid D: (but I freaking loved that moonkin transformation haha)