reason people fail in any DF content is communication or lack there of.

here's a recent raid set up I ran into
2 experienced t9 geared players
2 competent adaptable raiders with limited clears
1 person who says "hi I'm new"
3 people who say nothing "wildcards"
no one said anything or discussed anything, just pulled, someone rage quit after the 3rd wipe and the rest of us left.

another day another DF
Same set up, same raid, only this time tactics were discussed and mechanics explained, cleared on 2nd attempt.