I guess I'm one of the few freaks who actually prefers TFC to CS (although I love them both.) CS can be EXTREMELY addictive, however I personally get turned off by how serious most people seem to take it. Granted, it has reality-oriented gameplay (compared to others anyway) but I think some people are just a little too intense with it. TFC has intense wackos too, but I personally find it to be a bit more fun and lighthearted due to the instant respawn nature of the game. Plus, I personally love the idea of having entirely different classes of players (instead of just weapon selection.) Maybe TF2 will eventually be released, although it's been what . . . 2 years now?
It'll be interesting to see how much people gripe and moan once voicecom is completely available. Clans will undoubtedly love it, but I'm betting it'll be more annoying than useful for general public games.