You wanna become addicted to a first player shooter? Then go up against real people.
I have played this game since it's 2nd day of release, and have loved every minute of it. The 20.00 US is definatly worth it, with stunning visuals, great sound FX, and rapid gameplay.
Team play is definatly a must here, otherwise one will be slaughtered quite quickly.
On the downside, the game comes with no instruction manual (quite frustrating to us keyboard pounding newbies), does seem to lag right at your first couple of spawns into a battle (apparently this is due to all the sounds still loading up and playing for the first time). I seem to have a problem with not being able to type to my team or other players after 3 or 4 games. I know that this is not a problem with my system, as others have complained about this issue as well.
All in all, DoD: Source is great fun, especially if you have a bit of aggression that you need to take out on the nearest German or American.