I always use a mic. It's gotten to the point that I have a hard time going back to older, pre-voice over IP games, because these days I tend to stick to team based modes, and you can't really coordinate anything with text. I'd probably play some more old fashioned deathmatch, but the games that did that well are even older than the ones I was just complaining about, and tend to have dead online modes as a result. The notable exception being the original Quake, which I really need to get around to purchasing one of these days.