Good. The biggest problem with most Facebook games is that there is little to no actual gameplay. Has anyone here actually played Mafia Wars? It's not a game.
However, I don't think Civ would be a major success on Facebook. Most people on facebook like playing games that are simple and do not require you to think too much (ex: farmville). However, I'm still rooting for civ, simply because I'm also developng a turn based strategy game for facebook and it would be nice to see this category of games become popular on facebook.
I believe Zynga has publicly acknowledged that in the long run their games will need to have more actual game play.
That's not to say Farmville isn't fun, it is, but I find Country Story a little deeper.
After enjoying some proper online mafia games it felt like a wet blanket to me :P