Starcraft is easily defined as the best RTS classic of all time, serving as inspiration to other strategy games.
The three races in Starcraft are very well made and balanced. Also, it has a very interesting story, which makes you want to know what happens next. The bad of this game, in my opinion, is that it's story teases too much and delivers to little, with a very disappointing ending. Nevertheless, a very good and entertaining game to be played for a long time.
Fans of Starcraft all over the world, including me, hope for the coming of a sequel to Starcraft: brood war. Starcraft: Ghost's release would make me and other SC fans happy, but for some reason (a good one perhaps) it was cancelled by it's developers.
The game's story is in 60.000 light years from earth, where political prisoners where exiled from earth to a very distant galaxy, where they found themselves in the middle of a ancient war, Zergs against Protoss, two races in a conflict that has last for generations.
The Terrans (name given to humans in Starcraft) are technologically advanced, specially in genetics and nuclear studies. Their buildings are easily repaired and most of them can flee from ground units in a very funny way (they float). They are the middle race (the balanced), not too strong nor too cheap.
The Protoss (humanoids with high brain capacity) have extremely powerful and expensive units. They take quite some time to create an army, but when they do, they crush everything on the way. Their constructions have a relatively good number of hit points and a highly efficient shield but can't be repaired.
The Zerg (parasite-like creatures with high tissue regeneration capacity) are cheap, quick and have no kind of technology. Their buildings are biological and regenerate their hit points with time but can only be built in the creep (with exception of their main building), a kind of biological goo that covers the ground next to their main buildings or CREEP colonies.
The Starcraft gameplay is very simple: It concentrates in gathering resources to create armies and destroy your opponents, nevertheless it's hard to make the right unit combinations. Also, the multiplayer in battle.net can offer you a nice and funny experience with your friends even in the old Starcraft.