Ehh, it's bad. The start locations are fun, religion is great, the hun dilemmas are interesting and engaging. The unit roster is completely awful though and the campaign is devastatingly hard. Only a handful of units with weak stats, and when you tech up, they might gain like +5 armour and +2 attack which is nothing. No shock cavalry, weak spears, no swords, weak axes, no armoured units, no horse archers, weak melee cavalry (scout cavalry basically), weak archers, weak skirmishers, poison archers are OP for sure but don't ever let them hit your own units.
Honestly I was excited to get this after so long and ended up pretty disappointed. Use the SlavAlani mod in steam workshop to make the roster much more interesting and enjoyable. Otherwise i'd say avoid or buy 75% off if you're a fan and want the extra starts.