ElephantU is right: I am a great scenario lover (and I publish my results at Apolyton Strategy Forum, so it's easy for you to check what you achieve).
Among those I played recently, I would strongly advise "Exodus II- the partition" (designed by Nani) and "The invasion of Russia" (designed by Markus Eklund), but I don't remember if they can be played with Fantastic Worlds or if they require MGE.