I find this as a tank one of the best fights in the new content. Guild I am in has downed this every week on Hard mode since 1.2 released. We've had no bugs, if you're failing it's a L2P issue. Don't mean to sound cocky or arrogant, but really this fight isn't bugged. It took us 3 nights of 6 hours attempts to learn this fight, now we go in and 1 shot this, tanks and minesweeper boss every Tuesday night.
Video of us downing it: