I've owned this game for 10 years, I've played through the full campaign perhaps 3 or 4 times, spent years playing competitive games online and last week went onto Battlenet and spent an evening destroying my old school friends. We are all nearly 30 and still love SC!
The universe Blizzard have created is lush with detail, every unit has character and personality, every race is utterly different from the other, and yet give you an equal chance of victory.
The world editor is incredible, you can create co-op campaigns with hero units (even specify their abilities and hitpoints) script stories, customise your favourite multiplayer maps or create ultra intense micro maps cramming 8 players onto a 64x64 map for frenzied fun!
If you're new to the game and want to know how the experts play, search google for either 'pimpest replays' or 'Boxer' (one of the greatest Korean players) and watch in humble amazement.
Due to its comic-book looks, SC has stood the test of time very well and the system requirements are so low your toaster could play it! If you alive and have even the slightest interest in videogames, BUY THIS GAME NOW!!!!!