It's old, but it's still well done.
I agree this game may be a little overpriced, but I've bought some really crummy games and paid a lot more than this in the past. This is a really good game. Typical resource gather RTS game, pitting you against online, LAN, and/or computer opponents. And let's face it. Most of the new stuff for PC's has been completely crap lately.
It's one of the few out there that let you pit yourself and your friends up against computer opponents, or let you play by yourself against computers. The replay ability is great and really flexible. Even the sounds and music are good for a game this old.
If you want a standby, classic RTS, this is a great game.