Ah if people power-levels, there's something I am pretty sure about: The risk of not knowing how to play a L50 class.
The day someone tells me how to use skills being a L50 I'll just deny to explain it, since that someone should know that since when he ranked up his class =P

Also I don't like power-leveling, is boring. inb4 "But grinding is boring too", then don't grind and do leves & quests.