There's nothing better in HoI then trapping a 100+ enemy divisions in a pocket and starving them to death. HoI2 was too small and therefore encirclement's weren't as satisfying. But that's because you just build your armies and tell them in which direction to conquer. Finishing a campaign in a single day is feasible.
One good thing I can say for HOI4 is that it's very fast. But that misses the whole appeal of HOI where your hours of micromanagement pay off, and you get that encirclement just right, or get that multiple front and combined arms bonus, or when your mountaineers pay off. So you have to hand things over to the AI. With so many regions and separate divisions, you cannot really micro any major power in HOI 3 or 4. It had less regions, so you could feasibly micro.
