Get Bamma to play it with you, he's the master of 'loop holes'.
Bull Centaurs are awesome as special choices.
You can get 4 bolt throwers, along with 2 bull centaur units, and a pair of earth shakers to pin/slow down your opponents.
Add in a level 4 wizard, and 3 dwarves with bound 5 magical weapons(daemon smiths), and you have a very strong magic phase.
Mounting those daemonsmith on the chariot gives you a good rank breaking unit.
Add in dwarves as core (with eruption guns), blunderbuss dwarves, and then blow left-over points and dirt cheap hobgoblins/rabble, and you have a very effective army.
No real weakness to the army. Good leadership, good shooting, great magic, good melee, cheap disposable units and fast moving elite combat units.
From the few games I play-tested, the daemon smiths are a must. Rolling up a spell and having it always go off is so good. I went up against a bound 5 wall of fire, a bound 5 burning head, and a bound 5 fiery blast.
I would have more fun taking on this list any day of the week than take on an optimized daemon/vampire list.
-Matt