Digg is fucking retarded. Their numbers are wrong, and this statement alone makes me ignore everything else.
World War II Online (2001) - "- The first true hugely successful multiplayer FPS, WW II showcased large scale battles. Solid simulation and realism continues to make this a popular game with its growing fan base."
Hugely successful? No. I've never even fucking heard of it.
Not to mention that HALF LIFE AND CS CAME OUT LONG BEFORE IT. Digg has their shit all wrong, CS is still one of the most widely played online FPS' and it only got an honorable mention.