@Arc – I respectfully suggest that your teams just aren’t as good as you think they are. Warrior here, did it with two friends and two pugs, neither of the pugs I would consider all that great, and it took us two tries. Lot of runbacks, but it’s definitely doable.
Runbacks = deaths? No event in any dungeon should be designed around (or require) dying and running back.
That being said, I did complete this in a pug tonight using the 3 in / 2 out method.