Yea, calling BS.
Go troll somewhere else.
All hardmode bosses are doable without a tank for example my group has always consisted of a 3 dps and healer ( merc,marauder,operative,inquis) 80% of the time merc tanking though. Video here of our Revan hardmode kill for example(dont click if you dont want to ruin the fight for yourself ofcourse) http://www.youtube.com/watch?v=CzTRY5X8bJ8
i'm not the one who recorded it though i play the merc which i have 19.5k hp buffed in full pve dps gear.
But yeah the hardmodes are abit of a joke that they can be achieved with setups like this but its possible easy, we also have done more than enough bosses with my companion mako offhealing with 1 healer + 2dps, shame the hardmodes aren't actually that challenging.