Just did it first time last night. Duty Roulette group, first time for all of us. Most had a mix of iLvl60/DL, maybe a few pieces of iLvl 90. Wiped once to each boss (except the "third" boss). Otherwise, was a very straight forward instance. Some of the mechanics push you a bit, but as long as your group is organized it's easy (as the healer I marked the dogs so the DPS burned them down quicker, I also marked eggs so the dps knew which one to destroy, etc.).

If you have a group of mostly iLvl 90 who can't figure out this instance, I have not the faintest idea how you got to mostly iLvl 90, unless it was farming AK/WP for Myth tomes and you just bought every piece off a vendor.