People dislike the dungeon because it requires everybody to know what they're doing, and for everybody to be at least competent at their jobs. Otherwise, you will have a bad time. I was lucky enough for my last run to get a party who were competent, including the brand new SMN who was in there for the first time. We explained how bosses went, he did a near flawless job during them. A shame that most people aren't competent, which makes the place either take longer than it should or makes it impossible to do (I'm looking at you, DPS who don't use DoTs and AoEs!).