A few years ago I thought grand strategy games were a bit too complicated to be fun for me. I enjoyed strategy games like Civ, Galciv and most RTS games like C&C and Star Craft. But the Paradox games seemed to have a steeper learning curve than I was willing to scale. I had at some point received a free copy of Europa Universalis III for being signed up to the Paradox forums. I think I originally signed up because of Swords of the Stars 2 which they published. When they gave out EU III codes to forum members, I downloaded the game, got through the tutorial and tried playing the game. I had no idea what I was supposed to do and closed the game some 30 minutes later and uninstalled it.
A long while later a youtuber I followed, Quill18, started playing UE4 and specifically a playthrough as the Netherlands (my home country). This got me interested again and watching him play the game made it look a lot easier than trying to figure out how the game worked myself.
So I resolved to try grand strategy again myself. In the next steam sale I bought Hearts of Iron III. World War II has always been my favourite historical subject. It was pretty much the only time period I paid any attention to during history classes in school.
Hearts of Iron 3 was already an older game when I bought it, the tutorial was really unhelpful and I once again found myself in a position where I had no idea what the fuck I was supposed to do. Once again I turned to Youtube. This time I found a tutorial series by Alexlifeson1985. I watched a few hours of his tutorials to get the basics and watched a few of his let's plays to get a feel for the game. All in all I watched a dozen hours or so of youtube content before starting to play the game myself.
My first playthrough as the United Kingdom went horrendous. I failed to control the seas around the British Isles with destroyer fleets and naval bombers so the German subs destroyed all my convoys and I couldn't get the raw materials I needed to produce weapons or get lend lease from the US. The next game I started I had learned from my mistakes and I eventually managed to last until the end of the war and defeat Germany, although the Soviets did most of the heavy lifting and ended up with a lot of territory they did no get historically.
I did continue playing however and gradually got better at the game. So when I heard about HOI IV I started to follow development, I read every development diary and watched every developer stream. Once the game released on the anniversary of D-day I started playing as soon as it was available. Compared to HOI III it's a lot easier to play and the tutorial is somewhat useful this time. I have played more than 200 hours of the game, and I'm still interested in playing more. I have played games with all the mayor nations that participated in the war and a few of the minor ones too.
HOI IV allows you to play any nation that existed during WWII, yes ANY nation. No matter how small it's playable. Of course Luxembourg will generally have a smaller impact on the war than Germany does. But the game is more of a sandbox than HOI III was. It's easier to go ahistorical and, for instance, turn the US into a fascist state and get allied with Germany to conquer the world.
This has been the game I returned to when I didn't know what else to play. There is still lot's of stuff to do in the game that I want to try out. And the DLC Together for Victory that just came out fleshed out the British Commonwealth countries to a point where they've become much more interesting to play. I think the 200+ hours I've played so far are just the beginning for me in this game. This is my most played game and favourite game of the year and you should play it if you have any interest in strategy games in general and WWII strategy in particular.