I certainly seems popular. Log on and join a couple TFC clans after a while people will regonize the skillz, if you have any. I get my online FPS fix from Quake 3 Fortress. Quake 3 arena is in second place, and Unreal Tournament rounds out in third. ICQ As ashamed as I am to say it I haven't even bought or played Half-Life yet.
All signs point to it as being one of the great games ever made.
I imagine that that have similar gameplay elements. It is a vast improvement over Quake1 Teamfortress. It contains most of what you need to know to play the game and make play and server configs. Sniper snapshots are much easier and the body hit location system is tight. Don't expect a kill without a head shot or long charge time.