The Arena is mainly used for customers of Telstra ISP. This enables them to find servers easily that don't count towards bandwidth usage. Also some games require you to have "the Arena" running for ladder play so that the server recognizes you apart of the gamearena ladder system.
Alot of the times i use a program called Qtracker
If you've ever played a multiplayer game on your PC, the in-game server browser has probably left you wanting more. Qtracker lets you say goodbye to the in-game browser, forever!
From the convenience of one program you can manage all of the games you play, whether they're on the Internet or your LAN, without ever having to load a game. Find your friends, find new servers, watch games in progress, administer servers, and tons more.
Qtracker supports over 100 of the most popular multiplayer games, and is actively supported with regular updates.
It runs great for F.E.A.R. combat 1.08 .