"Easy to learn, difficult to master" is one of those game design clichés that get tossed around with abandon. It's also one of the often unheralded keys to the popularity and longetivity of StarCraft.
As real-time strategy games go, the original game is remarkable not for the depth of it's strategic gameplay (which is considerable), but for how Blizzard teases that depth out of a remarkably simple economy consisting of a just a few base structures and what by modern standards is a ridiculously low number of different units.
At Blizzard's Worldwide Invitational in Paris, France, GameSpy got the chance to go hands-on with the latest build of StarCraft II, the long-awaited sequel. There they found greater strategic depth hasn't come at the expense of user-friendliness or surface simplicity.