Lets just take those EX trials out of the equation. i see this alot even on normal dungeons and on the CT Raid.
God i remember back in XI when we did Airship fight or Divine might. It was really hard back then and if someone screwed up, dang odds are you will wipe. i spend hours and hours with the same party. But now a days people like to throw in the towl after one or two wipes. Just sad, i always feel bad for the DPS... searching for 30-50 minutes probably and then people give up...