I have to agree. The gap between the end-game community and those just starting out is huge. I've had a group in Amdapor Keep who quit after one wipe to Demon Wall, and we had more than enough time to go again. Wiped once in Thousand Maws or Haukke Manor? Jolly cooperation, my good man! Shall we give it another go, old chap?

Not saying everyone in endgame is like this, but if you PUG through Duty Finder, chances are you will experience this.