So yesterday I bought this game and when I tried to join multiplayer it allways stated that no connection to the server is possible. A friend of mine said he's getting the same issue. I looked through several forums (of wich are really few) where more players (possibly all) are reporting this.
Sadly theres no response to that by the developers or Kalypso Media.

I suppose the servers have been shut down.
So don't buy if you expect multiplayer. Isn't worth it for singleplayer only since it gets repetetive after a few minutes.