I still think that the best game inn the world is Warcraft 3.
...what? You may think, but I'll elaborate for you!
Warcraft 3, inn itself with its addet exspansion, and further improvements to battle.net, E-sports scene, etc was epic.
But what really makes it stand out it was what the community did for the game, something Blizzard surely couldent have forseen when they launched the game as an RTS.
1. Tower Defense games. Come on, so many variations of maps from Warcraft 3, witch led to many other different tower games and whatnot. Most popular is prolly Plants vs Zombies.
2. DOTA. Vi sitta her i venten och spilla litta Dota (did I get the swedish langue right ?). While I personally never liked DOTA, LOL etc, you haft to have lived under a rock not to see what DOTA did to gaming industry, a hole new genre of game.
3. They broke with the traditional RTS rules, build a base and win, by adding good story, and hero characters. And ofcourse it was the stepping-stone to WoW.