This is a long thread to get caught up on. I think towards the end of this thread there was a debate about game versus simulation, and in my own opinion this is the crux of the matter.
For those who think HOI III is a simulation of World War II, it comes up short, particularly in the areas of naval and air combat. If one views HOI III as a game, then it is up to par, and it is certainly an extremely detailed game. When I think back to playing Advanced Third Reich (ATR) boardgame, it is like the difference between checkers (ATR) and chess (HOI III).
From the webpage for HOI III
Genres
Grand Strategy
With nearly 15,000 provinces, Hearts of Iron III is not only five times larger than before, it’s also the most detailed depiction of World War II ever created.
now lets compare with a rival product which is limited in scope to just the Pacific Theater, which is War in the Pacific (WitP)
Field of Play: Operational
Unit Scale: Battalion with Individual Ships & Planes
As it pertains to naval and air combat the difference is again like that between chess and checkers, unfortunately in this case HOI III is more like checkers. From HOI III's own advertising the claim is made, "the most detailed depiction of World War II ever created", I can say right now from having played both games, the claim is not true, when one compares HOI III to WitP. I suppose an argument could be made that this is not an apples to apples comparison since one game covers all of WWII, whereas the other is limited to just a theater of WWII, but with respect to detail within the game, it is an accurate evaluation.
Having said that HOI III, does a better job of depicting land combat than WitP, even though HOI III has a greater level of abstraction. For many of us the Air-Sea campaign has been a source of frustration with how it has been implemented, and this has been ongoing since HOI I. I don't want these comments to be viewed as Paradox bashing, I have bought more Paradox, games over the years than any other company, and as of now EU III Heir to the Throne is my all time favorite game.
Having semi-ranted, Johan had mentioned the future of HOI III, I very much would like to see an expansion pack that focuses on fixing items that require attention, AI improvements, supply, and a new features be limited to improving the Air-Sea campaign. Which, I'll elaborate upon in a second post, since this post is rather long.