Another problem that I see (still) is that many of the minors have too little manpower to start with. The monthly gain might be ok but the start value should be a bit bigger I believe. I'm quite aware that it's a delicate balancing problem and that late game minors with massive armies was a problem in HOI 2.
But what we have now takes away all the fun from HOI 2 when playing a minor. And please note that many of us liked that alot. Now most of them become nothing but walker-on.
It's not much fun playing a major either when your minor opponents become roadway material as soon as you cross the border, is it?
Or maybe I'm just having a bad day at war