There seems to be a lot of things that could be added. The types of thing that most studios already know Bungie especially.
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Too Human a game made by Silicon Knights took 10 years to develop and it was incredibly mediocre and barely playable. This is highly playable, develop time doesn't effect quality it only builds hype to let people down. You should be surprised destiny is this good. Here's a free example Duke nukem forever, took 10 years.