The ME story was never anything special, but people feel cheated because they bought into the idea of "everything you do matters" and at the end of the day literally nothing mattered.
Plus the whole thing about the ending being nonsense in terms of the story... and... yeah, major fan backlash.
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http://28.media.tumblr.com/tumblr_lcb35gGx0t1qailr4o1_500.gif
http://www.megavideo.com/?v=57N0YAEJ