Might be fun in a year or 5.
On normal mode: ridiculously hard. A.i. doesnt really 'learn' player's tactics and try counter them - it just beefs up the enemies' armor class, and throws dozens of monsters at you. To counter just make a coupe of run n gun assualters and have the rest of the party spam rally the troops. Can clear a map on a single turn. Too many things broken with no balance.