Quote Originally Posted by Ludens
I am not a developper, but based on my own experiences and various comments on these forums I think the list looks like this:

1) Aedui, Averni and the Hellenic factions are mostly finished. There will be some changes and fine-tuning, but I think most content is in place.
2) SPQR and Casse lack several key units, but are otherwise very playable.
3) Hayasdan and to a lesser extent Pontos are missing important units and their traits aren't done. They are playable, but obviously incomplete.
4) Sauromatae and Yuezhi are crippled by low income, high upkeep and relentless rebels. Serious tuning is necessary here. Iberia is has servere recruitment problems and is barely playable as well.

I am not sure where the Getai, Sweboz and Phalava stand, but I suppose they are somewhere between 2 and 3.
Sweboz are in bad shape too in my op they cant recruit almost nothing east of there starting city. So good luck stoping rebels and others in the east.