I have the quest for the sleeper and I've done 6 heroic strikes, but only 3 of them have counted due to the bug in the system.
Heroic strikes are currently very hard. I actually don't mind. I think I've only done 2 of the 6 as full strikes. The rest I've been put into in process strikes and usually the final boss as someone got frustrated and left. We don't clear the strike quickly. I'd say the final boss has taken me at least 20 minutes and many wipes.
This does not bother me. I'm glad it's hard, it's actually fun trying to figure out the right strategy.
The frustrating part is the bug that isn't allowing them to count towards my quest. Yes, the end loot needs to be better, higher light. But I think they're working on that.
I'm just glad of content that we can't just rush through anymore. I got tired of doing them, as it was speed run all the way with blueberries.