Many aspects of the NFP modes are fun and interesting. My main problem with them is that some of them make the game way easier to win (and specifically since they are easier for the player to use than for the AI) like a hero that gives you free districts or major extra yields (e.g. the vampire castle). Also, some of them really make the game harder (yay!), but even more so for the AI than for the player. I've played dramatic ages maybe three times so far, and all of them half of the AI's empires collapsed under loyalty pressure. Not fun when the little opposition you have gets kicked out of the game by the game mechanics themselves.