Video here:
You will notice the Seigetanks sitting near a wall, not moving or chasing after anyone. Looks like rogues are tanking them against a wall and ignoring the mechanic entirely. Nobody else had to do this to kill the boss.
This is a clear violation of the EULA and goes against the spirit of the world race. This gives an unintended advantage for the fight, which you will notice has reduced their kill time from Method's ~10 minute kill to 8:42.
/discuss