Seeking input on an exclusively Undead army

[devmoon]

Im just tired of having to be so utterly careful about my army to not run out of troops and stuff.

The better units are so sparse its insane. Because of this im using houndreds of a bit lower level units. This is the reason i thought about undeads, they are good in numbers

So anyone have any experience with undead armies and the undead spells?