I shall repeat the same thing I did at Xfire's forums, and that is displaying the basic characteristics of the game;
The game is Starcraftish in terms of gameplay, but it has many more units available, since you can design over 50000 different units to use in-game, and online. You do this by combining parts of different stock animals, and thus influencing their statistics and abilities. The game also boasts an amazing graphical engine (at least for it's time that is), a campaign of 15 missions, an official online service (that has recently been shut down by microsoft, and then revived by a community member who dissapeared about 3 months after he revived it, taking the online service with him), a LAN service (which we now use as the playing mean combined with hamachi) and an amazingly fast and easy to use Mission Editor (if you ever used Far Cry 2's ME, you'll be very familiar with it).
It was made by Relic, so you know you'll have a good experience with it.