So, how would you change leveling if you were given the option? I would implement the following:
>Killing mobs gives no xp
>PvP gives no xp
>Dungeons give no xp
>Quests give you a percentage increase in your level
>On your first character, you need to complete all quests in the game to reach max level
>On every subsequent character, you're given the option of either going through that process again, or simply creating them at max level.
This isn't a Bioware rpg, the quests in this game have no replay value. Also, "you learn your class while leveling" has been disproven ages ago. There is nothing gained by going through the leveling process again, but this still leaves the option open for people who enjoy it.