Ultimately, my disappointment in Destiny is in how much of a good thing Bungie has squandered and is squandering.
They had a wealth of MMOs to study and use as basis for good mission design AND story. The misuse (or lack of use) of the lore alone is so disappointing. I've posted this before:
Someone on Reddit fleshed out the first battles for Earth after The City was built, along with the Twilight Gap, based on Grimoire.
Like--holy shit, these would be amazing to see in-game. Either via godly CG or in-game engine.
Even better: let us replay these historical battles as Strikes/Raids.
The Battle of the Six Fronts
-Unlock/discover the entrance of the House of the Devils
-Launch an assault on the House
-Retreat via vehicles back to the City after the Fallen swarm you
-Force six players to defend six separate strong points, using battlements/mounted weapons, as well as your own characters
Or something like that.
It would be pretty awesome if some of the named "heroes" of the struggles (Saint-14, Saladin, Zavala) would actually fight alongside you as NPC characters.