I don't think it's the ilevel and more like rope jumping required...mainly those crushing orbs. You basically win the fight every time but because sticking together to kill 4 of these orb links isn't intuitive at all your party ends up dying to them most of the time.

I ran the dungeon at least 20 times last week and won only once because all the parties kept on dying to that same last orbs mechanic at the end. So we basically have the skill the win the fight but because we didn't jump the last rope we lose.

At least in Titan EX you jump the ropes on your own and you learn as you die from them, but I really question the decision to make those orbs instant death mechanics when it requires 7/8 or 8/8 people to to all be alive to all handle those orbs at a very specific time, less than 5 seconds. That shouldn't call for instant death...