Just posting even more evidence about as to why keeping mobs lulled became viable. If you played a Monk in classic you should remember this change.
http://www.monkly-business.net/forum...read.php?t=627
Key words from the thread right here...
We've had the ability for awhile now to make it so certain monsters were totally immune to being lulled. This is especially common in higher level outdoor zones such as Cazic-Thule, since Harmony would take any challenge out of splitting groups of monsters. Having a such powerful game dynamic with no risk of failure made these encounters too easy, so we were forced to make many monsters totally lull immune to compensate. With this change to Harmony, we'll now be able to remove the lull immunity from many monsters, and turn this ability into a useful spell line that gives great benefits, but with some risk that your spell may be resisted.