There has been wide spread complaints that the rewards for finishing your personal story have been quite lackluster. For example, some folks have been getting normal green and blue rewards while some people, at level 80, are getting level 30 or 40 items. Arenanet is looking into fixing this:
Originally posted by Jeffrey Vaughn (Source)
I don’t set up rewards, so I don’t want to give any inacurrate information… But we are fixing this, and we’re looking at a retroactive reward for people who have already finished the final dungeon. (No ETA on either, sorry!) But you have not been forgotten, nor are you being ignored.