Back when I had my first computer, this game was a present from my uncle, because I had some intrest in WW2. Together with Conquest of the new world and Civilasation 2, this is one of the defining games of my youth.
After I was done with it (including the super difficult defence of the 3th reigh campaign), I discovered the campaign and mission editor. Mind you I still don't know how a lot of it actually works, but I was able to spice up some of the classic campaigns by making my own siege of Stalingrad, with both armies as huge as the game would let me.
Definatly s classic.