Basically the game mixes D&D with a RTS that plays like Battle for Middle Earth but looks like War 3. There's also the underground stuff in it. It's decent so far...
Well the building stuff works like Battle for Middle Earth from what I played.
But your units are like D&D characters and you go underground with them into a dungeon to fight mobs, gain experience, and find gold and treasure to build more buildings and units.
Aside from copying the building style of Battle for Middle Earth, the game combines D&D and a RTS pretty well. Very surprised actually.