It's a good compromise between aggro radius reduction and mana cost+cast time+recast.
Lull works sometimes, when mobs aren't tight together and/or are muh lower level. Pacify is needed sometimes, like if you're fighting in a small room with the pacified mob(s). But usually calm gives enough aggro reduction without sucking your mana dry when you get 3-10 resists per mob you need to lull.
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