Nah, saying a class is OP means that it is OP for the current content, not compared to the others classes.
Yet, i agree with you ( and i've said it many times in other threads), they shall redesign the job of Ast. It can't immitate the other two in one single class.

And about the sch place in raids, we could say the same about WHM. i've never seen any ast who could mainheal like a whm.