The way Arrival is and the way ME 3 is starting it really seems like they are designing the story with Arrival in mind but of course, they say they haven't. It really seems like they expect you to have played Arrival though. I guess if you are a big fan of the series, you'll have played it. If not, then it shouldn't really matter how they do their story I guess. Its not like the DLC is immensely expensive and only the biggest Mass Effect fans will get it.
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