I don't know CS:S, but my impression is that it's a pretty action-paced game. Ghost Recon is built around suspense more than action. It can seem very slow to people transitioning from other games, but the level of coordination required provides quite a bit of suspense. If you're looking for teamplay and strategy, you'll find it with Ghost Recon. But some people prefer a certain pace to their gaming experience, and you might have a hard time adjusting to Ghost Recon's slower pace.

With your IDF/Border Police experience I'd be willing to bet you'd fit into our structured play style pretty easily and could probably bring quite a bit of real-world experience to bear on our tactics. Read over some of our SOPs in the GR SOP forum and you'll get a sense of how we try to play this game and how the pace is considerably slower than most games.

Currently, we only really play Ghost Recon in multiplayer Coop mode, though it supports player vs. player gameplay. For us, this means gameplay is broken up into "missions". Each mission has a set of objectives on a particular map, and we usually take anywhere between 20-45 minutes to play a successful mission. We play with no respawns, which means a team inserts with a specific number of players and anyone who dies must wait until extract or mission failure to start again. Many or most missions end in failure. The no-respawn element and the mission difficulty provides the most reason for our intense, slow-paced gameplay. Without it, mission completion would be nearly impossible.

In addition, GR has a lot of elements built into its movement/fire mechanics that prevent run-and-gun tactics. Keeping control over your aim is central to success, so movement is slowed down, which generally promotes the use of real-world tactics (though GR is still a long way from approximating a real-world combat situation).