The most populated it's Counter Strike.
Played on it a year ago but it became to boring...

Nexuiz is my favourite

its free http://nexuiz.com

Hehe, CS is great. But it has exceeded my limits. Used to play it so much. Second FPS I like the most is COD2 on multiplayer mode. Really great if you find the right server.

Hmm.. It's hard to choose. I do like Counter Strike, and I have been playing it since I was 10. I guess I'll say that CS is my favourite FPS, and the best FPS ever.

AndreasB wrote:Hmm.. It's hard to choose. I do like Counter Strike, and I have been playing it since I was 10. I guess I'll say that CS is my favourite FPS, and the best FPS ever.

Counter strike is the best multiplayer FPS game ever, no doubts about that.