Just play it.
But then ID and Activision decided to make an expansion pack for Return to Castle Wolfenstein. For some reason the pack was canceled but the crew decided to publish the multi player version as a free game.
And now, almost three years later it still ranks second in most online played games, just after half life 2. Why? Because it's so much fun.
The game is extremely high paced, there are five playable types for both sides( axis and allies), and if you can find a server with good players there's even a hint of teamwork.
Obviously clan wars are even more fun as with clans you can rely on cooperation and the result is two sides combating each other along objectives such as guiding a tank over a bridge and through caves or through a city to blast the doors of an axis bank and use a truck to steal the gold.
The gameplay lies in the speed, the ability to sprint and jump around and in the clever design of the maps.
Graphics are dated but the game is dated itself.
Sound, not the best out there but they get the job done, I gave it an 8 for the large amount of chat option voices. (ever heard of "need a medic"? ET invented that phrase).
Value, it's free! and it's a superb game!
Tilt: Play it, you'll understand.