Warcraft 3 is a revolution in playing online RTS's. Using Battle.net, you will get so much more out of your game........
You can engage yourself in a fun custom game, you can join a clan and battle other clans, or you could join a competition and battle it our vs. other players. This feature really adds a huge umph to Warcraft 3 making it so much more worth the value your paying for it.
Don't get me wrong, the offline campaigns will keep you happy for a while. The missions are fun, easy going and the story line in this new expansion continues from the Reign of Chaos making the the storyline enthralling.