Level 28 now, just need ascendant shards to get to 29, did the nightfall because I heard you can get 11 from it, got a legendary scout rifle... Damnit why did they have to patch the queen's bounty rewards. There is literally zero incentive to do them now. At least when I could break down the chest piece it gave me 5 times in a row I could break them down for shards for my armor. Now? What's the point for anyone level 25+ to even do it (since I assume most that are 25+ have legendary gear).
Patching the loot cave sucks too, so the best method might just be the dark beyond mission. 30 kills in 2 minutes, rinse repeat, go to cryptarch, buy engrams level up. I would say doing the Vanguard or Crucible is the best option, and don't get me wrong it is up there, but after the 19th time you've played each strike, it gets a little stale.
I'm going to do the weekly (Nexus) strike tonight on 28 for the 9 coins if anyone wants to join. PM me, or post here, I'll add you.