I was just expecting maybe some special outfit or weapon....or maybe just a damn achievement.
What joy is there in doing/collecting 100% of the content if there is nothing to show for it. None of the side quests added anything to the story, so they were nothing more than chores. The extra tombs were okay, at least.
The knowledge and joy it brings to have finished the game? I couldn't care less about extra stuff, once it's 100% done I don't plan on playing it again...