Hearts of Iron II is a truly fantastic game, after spending just $4.99 on this (plus a little P+P) it promptly arrived and managed to quickly set itself a shining place on my gaming shelf.
The game is great fun, you can take the helm of so many different nations at different points before and during the Second World War, the game play is hugely in depth and will take some getting used to, but that's not a complaint, just about everything you need to do to run a nation is included. The possibilities of your nation's wartime shenanigans are endless, whether you want to start a mighty union helmed by Uruguay or avoid World War II as a Communist Germany, you can do it.
My only complaints would be that sometimes you just can't negotiate with some nations due to historical accuracy and that the game play is time restricted until the game totals up your scores, and sometimes you just can't get everything done that you want to in the time given.
I would recommend this to anyone taking a step up from perhaps the "Axis and Allies" area of warfare games, but it is a BIG step still, so be prepared, and keep trying, you will get used to it.