I actually use this in my basic pve setup - that combined with roar lets me push & pull mobs around the way I want which helps a lot in PUGs to grp stuff up for your AEs, as mentioned b4 prolly not needed with a decent CW. Though i absolutely love to pull stacked mobs in and IBS them.
What about the fact that this bug abuse was going on a much longer time, if only used by very few before yesterday? Were those guys tracked down and their doings reverted individually?
What i found was helping during leveling in dungeons is to simply get hit! You wont get much determination without taking damage, so stand next to the tank / healer and eat some AEs and stuff. Try to have pots though so your healer wont hate you! ;)