I bought it on Steam a while ago. You can use a controller with the PC version if you want as well. If you have a wired Xbox 360 controller you can just plug it in and map the controls to your liking or if you have a DualShock 3 you can download a program called DS3 Tool that emulates the 360 controller but you can use the DualShock 3.
Unlike modern shooters, using a controller won't hamper your performance in comparison to people using a keyboard and mouse, especially since you are already adapted to the controller.
I don't play often but I use the same GameSpyId (SG-17) as the PS2 version and I play mainly on the following servers:
http://www.gametracker.com/server_info/207.210.252.17:3659/
http://www.gametracker.com/server_info/69.65.40.10:3658/