There is a review of this on Rock, Paper, Shotgun.
Another review at www.grogheads.com
I have not played the demo or the game yet. But having read all of the reviews it seems like a modern Master of Magic. This game is much less building oriented and much more combat oriented than Civ 5. Many are commenting that the game is addicting and gives that "just one more turn" feeling.
Although I hate the Steam only distribution, the game is only $20.