If you want a challenge , do it in an under geared pug. They tuned this down because pugs with mdps couldn't coordinate enough to do the mechanics. For example, with my guild on vent, we managed to one shot it on my first time in this fp with all mdps ( pre 1.4). Post 1.4, I couldn't get a group of pugs to work together on the obvious mechanics. While this is a lol face roll for experienced groups. It is still a challenge for pugs.
EVERY hm is a challenge if youre too stupid to learn game mechanics. You wont even beat BT hm in full Dread Guard without knowing game mechanics, Yadira is gonna own you everytime with her cyclone smash!!! LOL