During a legal battle between Activision and Call of Duty creators Vince Zampella, a contract was revealed for Activision and Bungie:

" Activision shall pay to Licensor a quality bonus (the "Quality Bonus") in the amount of Two Million Five Hundred Thousand Dollars ($2,500,000) should Destiny Game #1 achieve a rating of at least 90 as determined by gamerankings.com (or equivalent reputable services if gamerankings.com is no longer in sen/ice) as of thirty (30) days following the commercial release of Destiny Game #1 on Xbox 360. "

Right now, Destiny is nowhere close to a 90 on GameRankings. It's unlikely if not impossible for the game to make that score by next month.