As someone posted in another thread - AST can clear content. Gameplay-wise, it's pretty solid.

Identity-wise, it needs a lot of work. With no clear identity on its own (diurnal/WHM and nocturnal/SCH) it not only has to compete with itself (which stance is better. There will always be one that's better) but it will also compete with the other healers. It needs its own niche of healing.

Yes, it's got a card drawing system - it needs to be emphasized more.