I race through them because I want to get max vanguard points as fast as possible so I can buy legendary stuff just to break down into ascendant material. I've gotten two exotic drops from cryptarch that were for a different class (I ended up creating a warlock just for the chest pc) and the exotic auto I use I bought from Xur. Two of my armor pcs were from the queen's bounty. The only good drops I've gotten were from VOG. Because of the VOG once per week raid limit I have friends actually level another character of the same class just to take advantage. I myself do not feel like spending 30 hrs just to level from 28 to 30. I've gotten a couple purple engrams since the patch that turned out to be strange coins. My point is even if you are lucky enough to get legendary stuff you still have to grind for the ascendent material. This is a grind game, which makes no sense because there is no monthly fee.