They're not useless as such, but they're just not really good at anything either. It's stats are mediocre, it has no rend, it's unbind is superfluous given how many wizards we have, and the slann being borderline mandatory nowadays. It has little to no synergy with our other stuff. It's not a hero so it can't take an artifact/command traits. The only thing that it has going for it is that it's our only unit that can get a bonus to it's charge distance making it one of the few units that stands a chance of succesfully charging after a teleport or summon. All of which makes it somewhat of a let down.