Some Pros and Cons to this build...
Cons
-Trolls have minimum +2 racial unrest with all other myrran races, so taking early non-troll neutral cities is essentially a waste of time. (
http://kaarsen.home.xs4all.nl/MoM/jarvinen/racialunrest.html)
-Trolls can't make sage's guilds and thus can't make alchemist's guilds so no adamantite weapons.
-Trolls are pitiful at erecting cities since their production and growth rates are abysmal.
-Once a troll is black channeled, it can no longer level, so only a few of mine reached elite and none reached ultra elite status. Funny side note; Jafar dispelled my black channels a couple times... the unit remains undead and has no upkeep of any kind and still cannot level.
Pros
-Trolls CAN make cathedrals, so infernal power is pretty good at quelling unrest (even additional unrest from dark rituals), but (minor con) I haven't really figured out how to justify 2 picks in infernal power since alchemy provides plenty of mana.
-A troll that dies in combat comes back to life with full health AND retains black channeled.
I'm middle of the road on this.