It is a highly regarded RTS game. The fact that it was originally published in 1994, and the Brood Wars 'expansion' in 1998, would make one think that it would be useless today. But even though it runs in 640X480 mode the graphics are reasonable and it is quite playable. At least if you can handle RTS style games.
Even though I don't like RTS games I downloaded it from the P2P system and tried it out simply because it is so popular and highly regarded.
The units are quite appealing. The Terran 'Siege Tank' for example makes a hefty 'clank' noise when it goes into or pulls out of siege mode, and the 'sergeant' character commanding it has classic command responses. The various Zerg units -- all 'monsters' of some sort or another -- make quite satisfyingly 'nasty' noises. My favorite for special effects is the Protoss 'Archon'. A black 'shadowy' form surrounded by a glow of energy, it's the classic metaphor of extreme power. In combat it attacks by shooting 'lightning' from its hands rather like the Emperor in Star Wars, all the while chanting 'Destroy!' - 'Annihilate!' - 'Obliterate!' ... etc. This unit is guaranteed to bring out the inner 10-year-old in a gamer.
But as fun as the individual units are this remains an RTS game and true to form it's impossible for a human to keep up. No matter which race you play and how hard you push to develop your forces you will always get over-run by an impossible wave of AI forces. I finally got tired of using the cheat codes just to survive and deleted the game.