After reading your post I actually went there on a fresh level 120 with good gear from the previous expansion (iLvl 221), to check if there was some odd anomaly with scaling in the heroic version of the dungeon, but, as expected, the enemies in there are level 85 and my auto-attacks kill almost everything in one hit, other than the bosses, who have taken three auto-attacks to kill. So, if you were struggling in this dungeon with five characters at level 120 (iLvl 380), I am honestly not sure what advice could be given, and I am questioning whether or not you're referring to the correct dungeon.
This isn't a question about whether you're bad at the game, it's that what you're saying just doesn't line up reality.
EDIT: To put this further into perspective, I went to the final boss of SFK (Heroic), turned my back to him so that he had a better chance to hit me, and I went AFK for about 20 minutes—this is the result (50% health on a DPS Fury Warrior).
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