Starcraft is the best game I have ever played! And the game I play the most too!
Even today, none strategy game is better! And every time a new RTS came I wonder if could be better, but isn't.
But it is only worthy today for the multiplayer...the single player is average.
If you wonder how depth it could get, I can say that even after 10 years is things to be discovered. It has the biggest sets of progamers and tourneys in any game today! (In korea touneys prize is about 100.000 US dolars and finals could get +30.000 spectators)
So if you want, you could spend the next 10 years playing and couldn't master it at all...
The gameplay is still the best in the genre! Probably because it is 2D! It is fast, accurate and gets better and better with practice! It's very rewarding!
So if you never played, try it. You wouldn't regret even today!
It is that great! No, it's the best RTS game ever! If not the best game ever!
Hope Starcraft 2 surpasses, but I doubt!