Why people says AST is bad?

[Mhikail]

This is the rule for stances:

If WHM go Diurnal or Nocturnal per fight basis.
If SCH go Diurnal.
If solo, Diurnal in most cases. Nocturnal is per fight basis.

Not this:

If WHM go Nocturnal.
If SCH go Diurnal.
If solo, Diurnal in most cases. Nocturnal is per fight basis.

I use Diurnal for everything.
The shields is took damn weak when you have Regen Heli and Bene and shield Regen. It dies in a milisecond and the MP given for a shield is not worth it.
You already have to manage your MP to the tee. Also, they give us a weaker Sacred Soil that barely does diddly doo da. Hell, once in a blue moon you see SCH use SS.
It just tops so much more. Let me know if you find a real good use to Noct because I'm not seeing it.