...I think that there needs to be something that still sends the Evil path tot he Underdark, even if only say the front half so as to not effectively eliminate an entire area of XP from killing and quests. Otherwise you will have inferior Evil heroes comparatively speaking to their counterparts at the same point in the story. Granted it hasn't been released yet but maybe the overland path will have some combat and quests to help match this up?
Theoretically, there may be the same amount of XP in the land route as in the Underdark?
