Something nice I've noticed with this "Big bad powerleveling" is although there is no level sync, a lower level player (say Level 34) can tag along with some friends doing leves or just exping (say rank 44+) and get good exp and have fun with them. Mind you, it hurts the exp of the higher level players and the low level can die much easier but they get the advantage of bringing their lower level friend along and helping him out.

Additionally, so far at least, I've noticed a high volume of exp party shouts. Maybe this will decline as time goes on, (or improve once we get a better partying UI?) it's hard to say. But so far, the powerleveling pros seem to outweigh the cons, lease from my perspective.