The problem isn't the stacks, it's the damn dogs. They always swarm the healer and it seems like there's always at LEAST 3 of them running around, regardless of how fast we burn them down.
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One full i90, others around i85 and we beat it on the second try after knowing the whole seduction thing.
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.