An RTS (real time strategy) game developed by Blizzard entertainment in 2003, shortly before WoW. It has an expansion pack called the Frozen Throne.
The game is the little brother of Wow, and has all the excellent replay value without the addictiveness. It has a very powerful map editor, which allows a variety of "custom games" played online on battle.net
I quit WoW, now I play Warcraft III occassionaly.