I played a tournament with a monster army before, here's a link to the report:
http://venivididouble1.blogspot.com/201 ... -none.htmlThey're pretty cool to look at and if everything works out well then they're quite powerful, but 2 things I learned while testing armies for that tournament:
- Non-chieftain/non-captain Trolls are completely worthless, they must be one of the biggest wastes of points in this game because they are insanely slow and die too easily. Essentially everything that can't at the double and has only Hard to Kill is worthless. Troll chieftain in this case is miles better because he moves up to 16", can duel heroes (and with F8 that's not too bad) and doesn't get killed by a random non-hero-containting formation of archers in a single turn.
- Stone Giants are the best monster units in the game because they're really cheap for the EHtK rule and generate 12+ attacks against F4 formations, eating almost everything on 3+
It can work, but it's generally not very good. However, an all-Fell Beast army is one of the best in the game I found (I mean the 5 wraiths Battlehost) - my friend used that at the WotR GT last year (I will probably be using it this year because it's an army with insane capabilities) and on his way defeated Gorgoroth Horde with 5 foot Wraiths, Grey Company with Galadriel/Elendil/Aragorn/Dain and I believe another 3-wraith force, only losing to my army in the final game where my one lucky Mumak/Overlorded move killed 3 of the wraiths in the 2nd turn because of the rules of deployment in Maelstrom of Battle. I would've probably lost if I hadn't lucked out there.
Multiple Dragons fare pretty well too, although they're too easy to defeat with 5 foot wraiths, while the Nazgul Battlehost can move up to 36" while killing with mutli-swoops and casting multiple spells.