I love her. She always stuns 2 - 3 players at minimum with a lvl 12 rune and she has 30 +hit built in and with her skill resist, she rarely gets stunned herself (almost immune). Once you get her magic attack up, her damage is not as trivial as one may think. She can easily do 35k - 40k dmg to all party with maxed staff and high break.

Stunning 2 - 3 key players in a given round is a game changer in many instances.