The game was a great success, and though I have certain reservations about the use of cards, they certainly added a different dimension.
I was worried about the cards, but after I found out the cards did not control the game, it was good. Like you said, the cards only add a different dimension. I like how the cards do not control the game, but allow the players to modify the game. Also, the cards add a level of fog of war to the game.