im surprised you feel like warrior is in a bad position, actually it has incredible durability even as a 2handed one... so with this barrier and the stunlocks a warrior is a serious enemy, along with all the cc-reducion, immunitycharge etc (and with enough bloodlust as long as thearrier is up the warrior wont go under 95% often at all)
to me, game actually feels pretty balanced among the classes
and yes, psi is an excellent class without doubts