From: Bluffton, South Carolina
It's an engrossing game, because you aren't focused on "micro mechanics and rules", but on developing and executing national level strategies for your armed forces. You can play the game straight up ( I recommend so for the first play through ) and follow most of the historical choices made by whichever alliance or nation you choose. You can try out some of the historical "what if's" that have been discussed since the 1950's - Sea Lion, Spain or Turkey joining the Axis, etc. You can even try some serious out of the box stuff, as Germany, attacking the Soviet Union BEFORE taking France. It is very replayable, with many mods available for alternative types of gameplay.
The AI is competent, even crafty in operational situations - grand strategy exposes some of the flaws endemic in trying to counter wily human beings - but it still plays the game adequately. It is worth the VERY reasonable purchase price, and check out he mods section after some playthroughs to extend the game value and experience.
Fondly remembers SSI's "Clash of Steel"