I've been in a similar boat this wee. I've just done about 4 extra HM crota kills this week and left 3 due to game stuff. I'm starting to feel very repulsed by it, maybe I just burnt out or maybe I'm just sick of playing a broken encounter.
I haven't played for loot/rewards since I got the coveted TItanhorn ( nothing else to look forward to). I've been playing because of the people and it pains me when despite our best and most concerted efforts the game sticks it to us. It hurts to hear the sighs of my teammates when I tell them the sword is gone or I got insta whacked by crota(insert the grief caused by knights and crota's somewhat variable kneel time). It's crushing when you're at the 5th hour of an encounter that should have been over in 15 mins, 45 if you mess up a couple of times.
While playing I feel like I'm at the game's mercy, helpless and constrained. I can do nothing to get the team out of a repeated cycle of failure. Give it anything but your best and you die earlier, give it your best and you die later. To win the game must allow me to win and that is quite off putting.
Do you mean the calling? I think the culling is a fusion rifle (I might be wrong)
Edit: I was totally wrong