At this stage of the game it might be easier to plan to do this dungeon multiple times to fully experience it. If you have turned on the setting to auto-skip previously viewed cutscenes you'll be able to go through faster and keep up. It'll still be hectic but hey at least every time you clear you get a good chunk of myth to help gear up.
There are two sides to this whole story and I certainly sympathize with first timers who aren't able to fully enjoy these dungeons. However, the opposite side of the coin is that a lot of the people who are running this through the roulette are in there for the 500th time and just want to get their myth and move along onto something they haven't seen on a daily basis for the past 6+ months.
