The tactical advantage of voice communications is enormous, though. I play BF2 while on the telephone with my friend. We use an "overwatch/assault" approach, with the security/overwatch troop spotting targets for the assault/maneuver troop via voice comm. The security/overwatch element contains the squad leader, so the assault has a spawn point.
I'm pretty addicted to BF2. The commander mode and squad leaders as spawn points add so much to the FPS genre. One of us will often play the commander -- the ultimate overwatch position.
J