User blog comment:The Milkman/No Love For Leviathan?/@comment-24174486-20120915231103/@comment-4237253-20120917043218

Those conflicts were not of the same scale. Those were hurdles, not major themes that need foreshadowing. To put it simply:

You do not introduce anything new in the end of a story. The writers of Mass Effect 3 did this, and it's why the ending is a failure.