People keep focusing on unit rebalance, technology rebalance, SBR, rebalance or perhaps economic rebalance (through NOs and Vichy) but none of those things are the problem the way that I see it.
The dynamic problem is that in making the game have so many fun options and flexibility, the game designers have given the Axis too much initial advantage to work with and that Russia is too weak to withstand a focused assault
by experienced adversaries regardless of luck or the exact way the Allies or Axis play that assault out.If you make Russia stronger, it becomes too strong for Germany to have any options (they must attack Russia and all the Axis must help).
But based on our last few games, if you thought the German and Italian “can-openers” and SBRs and air stacks were too much to handle, the German and the Italian AND Japan “eastern 3 way can-opener” and “early, unstoppable, cannot be scrambled against and before and after you repair SBRs” makes the game devastating and not really capable of being “patched” in my opinion.