User blog comment:The Milkman/Mass Effect in Retrospect/@comment-3228423-20130417021124/@comment-3228423-20130417122426

Maybe it wasn't, who knows? But I agree with you, the least that Bioware could've done was explain how ME2 and Arrival was relevant to the actual plot of the story.

Hell, as far as I know it's to set everything into place for when ME3 comes around.