Great game! Just a word of caution: As with all Grand Strategy games you are going to sink hundreds of hours into this game before you get a hang of it. As far as Paradox games go, it is easier to pick up than Crusader Kings 2 and harder than Europa Universalis IV. Much more streamlined and cleaner than Hearts of Iron III, so its more approachable-- which I like. It is definitely among the best WW2 strategy games.
For those who have not bought Paradox games, there are a few things to keep in mind: 1) Their games are expensive and most of the content of the game, at the end of day, will be in DLC's. DLC's normally cost 10-20 dollars, depending on the content. Same applies to HOI IV. So if you are on budget for games, you should probably avoid Paradox Games. 2) Do have patience with the game. I have had several friends get bored of the game because they did not have the patience to learn the game. You will make some laughably stupid mistakes, and that's okay, we all did when we started out. Just give the game time and you will be rewarded.