Destiny was released with much left out and this is widely known.Destiny 2 is this year, but you seem to say yourself above that it's The Taken King that is really what you have to review Destiny on, and that took a year to release after the initial Destiny launch. I mean, they managed to bleed more money out of people before then, and honestly, it might be the most successful open-wallet grind in the history of gaming.
Launch and year 1 content was one part of the 3 parts.
TTK and its content was another part/year as was ROI.
To accurately rate Destiny one would have to take the game as a whole.
Doing it this way the game is GREAT and still one of the top played games and this will help Destiny 2 to soar.