Much better than I expected, seeing as I don't like deck-building games as much. I do appreciate the mini civ-building aspect to the game as it gives it a bit more depth than others I've played. Game was easy to learn, and quite fun to play! Artwork on the cards is also top-notch.
I was lucky to play this game at my FLGS recently; everyone who played took to it easily and addictively. I agree with the suggestion: if you like Race for the Galaxy and Dominion, you'll like Eminent Domain... but don't think it's just a blend of the two. All three are unique and awesome games to have!