so basically u are complaining your main / team eg: wind with female or lighting with swords last for 2 fully rounds with fully immunity pre-battle, and its covering females or what not all your swordsman? are some how its still under power vs genjutsu mirror that only works for 1 layer debuff and gone within 1 time its trigger per round and it can reflect to clone or puppet or even immunity and doing nothing? so u think u need all of your ninjas having shields while immunity? and hits rock solid hard? and leeching too? that alone is far from balance dude. its a random defect since u got no clone/s or puppet/s thats why its just defect to your other ninja that are available.

now lets flip the side u play as fire main vs equal enemy with LM and his swordman's within same bracket. will u still even consider "genjutsu mirror" is that GREAT? lemme answers that question: its not even a close as a passive skill, its heaven and earth. day and night.