Do you get XP for succesful rolls, on a slightly related note? I avoided the initial fight at the ruins with the raiders and thought, that is 100xp per character gone, could have gone a long way. I think every action you take should grant XP. On combat XP or in general, I think it is fine for the EA, as there is a cap that you will reach rather soon, so it does not matter and is likely to be adjusted. Personally I do not see the need for giving XP from mobs at all, but from interaction and solving quests in certain ways.