Someone's been to SA too often.

I don't think Mictlan is underpowered at all. But you only really have 2 options to play them. Blessing or Blood.

Carrion Woods on the other hand I feel needs to be changed. They have heavy morale problems if you try to go living/dead. If you go pure dead, then you are slow to start. They have no randoms availiable so they can't even use some of the possible good combinations with their picks (Foul Vapors for example). Manikins and Carrion Beasts are slower to make and more vulnerable than normal undead.