I really like how the porting of the mod from Arma went, the game is quite balanced and I was able to see things unexpected in older versions (like Mongolia losing against Xibei San Ma, for example), and I can't wait to see how it will become when and if the tech tree and mobilization system are adapted.
But in the games I've run I've noticed some problems:
France always attacks Germany on may-june 1939, earlier that than in the Arma version (usually january 1940), which leads the Internationale to a crushing defeat since at that time the French army have not completely modernized or is stuck in Italy, being an easy prey for the Reichswehr;
the French, British and Italian AIs have problems to do amphibious assaults, as they can destroy the Danish army and navy and still not try a single landing (the situation is even worse if the target is distant, like Canada or Australia); on the other hand, the German Union AI likes to land on the most improbable places (in my last game they landed in Cayenne, Borneo and Vancouver Island);
if Poland enters MittelEuropa and gains German support against Belarus, this will cause Poland to declare war agains it even if the puppet status has not been broken, resulting in a weird situation where Germany is at war against all of MittelEuropa and White Ruthenia;
Russia has a lot of problems about cores and claims, as the events that make it inherit Central Asia destroy all the IC in the area without a proper reason (if the player defeats Russia and frees Alash Orda it would get only 12 IC, which is nothing against Turkestan); for some weird reason Soviet Union can integrate Central Asia faster than Kola or Siberia, which tend to remain claims.