I'm still rampaging through Europe as Sweboz atm; in a sort of "Amber Wars" scenario with Getai (on and off fighting for the last 25 or so turns). My Roman campaign is a bit easy compared to the others; I've reduced the Kart-Hadastim to an insignificant Balearic-Iberian kingdom and have pushed the Makedonians into Asia. My Casse campaign is possibly the hardest. I've so far only managed to take southern Britain and the western Belgae area. Fun stuff. Baktria was strangely easy. Kart-Hadastim was hard but rewarding. Hayasdan was insane but fun (I was reduced from a Caucasian superpower to a small Crimean kingdom before I finally gave up on it), and the Yuezhi were practically impossible (I've tried to play as them on about three occasions and have only once been able to expand successfully out of the Tarim basin). Loving it.