Sometimes I wonder if people make these threads just to be laughed at.
You can stand in all of the "AOE" and be fine. I've watched melee stand in the Sith's Force Storm and barely take any damage. The same goes for Gil. The stun? Meh, doesn't impact your ability to kill the boss.
If you're not beating the enrages for these bonus bosses, it's not because it's anti-melee. It's because of you.
But many groups I've encountered have such problem. It is indeed easier with 2 range DPS than 2 melee, under the level of same gear and skills.
You can't say someone can do it so everyone should be able to do it.