Destiny has so much going for it. It's gorgeous. The combat mechanics are great. It has a little bit of everything for different tastes.
The problem, imo, is there lacks a strong narrative to tie everything together. To give us a sense of who/what/why. There's really no purpose to it all, which is such a waste considering Destiny has the tools, unlike every other generic FPS out there, to be something special.
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It does there is the grimoire which has background info and the like. Check it out