I thought the community had been clear about echo of lilith, one-shot mechanics are garbage. Tried Dark Citadel with a friend, torment 3 for a laidback experience.
Nope. Stupid oneshot mechanics at the boss with drops you have to pick up in red pools of nigh-instant death. Oh you got it? Here you go Impending Doom to oneshot you.
And all that for some of the worst rewards ever.
Not gonna bother with that crap.
Ran it with a friend yesterday (first time) with no issues. Maybe you should learn how the mechanics work. 
lol now you find out? 
Learn the mechanics - but I guess it’s easier to complain on the forums.
I’ve ran it from T1 to T4, farming all basic and greater cosmetics sets and over 100K Citadel Coins - it always depends on party members.
I’ve had good runs with a single person, and terrible ones with a party full with people who knew not what they were doing.
Chances are you suck my man. Git gud.
It’s not garbage just takes some time to learn.
The rewards are garbage though so no need to run it more than once.