I don't think Afflick was trying to create a movie that accurately portrays what happened in Tehran, he's a Hollywood director trying to make a movie that sells, ie. he want's to make money, period, and he succeeded. If he was trying to film a documentary he would do more investigating and research, it's not a documentary, it's a very entertaining movie with many parts embellished to make America look good and fuel their patriotism, so what, we know better, regardless the movie will win IMO due to it's entertainment value .
I've seen every movie, except for Beasts of the Southern Wild, and while I agree many other movies have certain areas that are better I still think Argo is best overall, thus best picture winner.