You can stun the leg which releases steam to drastically reduce the damage of Perpetual Ray (from 6k to 2k or so), making orb soaking significantly less dicey for non-tanks. Very few seem to do so though, despite me mentioning it most of the time. :(
And personally, my DF experiences have been fairly good. Would say there's about a 70% success rate for my part, discounting wipes. I'll admit the bad runs tend to get really bad, though. Tanks dying in the Quarantine due to poor DPS and hitting the enrage timer with 25% HP to go, or the entire group getting the Judgment Nisi debuff because no one pays attention where they run. :D
