I may be flogging a dead horse with this one - but I don't see many people talk about how big Bungie is and what organisational issues that can bring.
I get a sense that a lot (not all) of the issues with Destiny are related to big teams moving in different directions and not talking to each other.
Deej and Jon..bewks...newsk? sort of mentioned it on a recent Guardian radio podcast whereby some of the key teams have now started sitting closer together and realising they need to talk to each other...
One team is doing PvP maps, another team does weapon balance, another team does sandbox design (i'm least clear on this one but i think it involves deciding that hammers of thor should exist), another team - the mysterious "investment" team - presumably decide the loot drop structures and rates, another team does the ongoing events...
For PvE I bet there are at least two teams, one for story missions and one for Raids...maybe another for strikes and possibly sub-teams of 1 per strike (I don't know).
It just sounds like an organisational nightmare, as to players it all has to work seamlessly together...or is meant to.
The non-playing character drops are another example of this IMHO, as has been mentioned.