Even though my icons don't show it, I bought HoI 1 and HoI 2 within days of them coming out (haven't bothered to register them here).
HoI1 was quite literally unplayable on release. It was a mess. Even after they got it at least working they still had issues to clean up - all those improvements you researched? They disappeared after a save. The basic problem was that the game didn't bother to recalculate your technology based benefits after a save. HoI1 was never really that good without mods.
HoI2 was better when it came out, it was at least playable, but it still had... issues. HoI2 once patched up was okay, actually to the point that it could be played vanilla. Mods tended to make it better though.
I'm not terribly surprised that HoI3 is in the state its in. Paradox has absolutely horrible QA, its better than it was in the days of HoI1 (oh you should have seen the forums back then), but still not that good. Still, this game is in pretty good shape, needs some tweaks to Diplomacy and Supply, probably a few other things I haven't noticed. And the code needs to be optimized - a lot.
How could this game have been considered finished with some of its obvious flaws? In between the diplomacy being shaky (Sweden and Switzerland rushing to join the allies? Please), and the serious problems with the code being slow and getting slower as the game runs, it seems hard to imagine. Obviously it couldn't, but that is par for the course in the gaming industry, and particularly for HoI games.
Release, then patch to the point it works.
Extremely frustrating to be sure. But that's the way it is.
And whining on the forums is to be expected, even from a good release. I remember when Stardock released Galactic Civilizations II, they started their own threads on the forum called "Starting Class Action Suit", "This Game Sucks", "Stardock Stole My Money!", and other things like that. Obviously tongue in cheek, and GC2 was a strong release, but they were right to expect that kind of screaming and hysterics.
I'm not going to be overly excited about what any of this means. Its nothing new.