Well actually, the server admin should decide (assuming it's a dedicated server and not some match-making crap).
If you want to talk on public servers though, just use text chat. That's the way it was back when I used to play FPS games a lot. Text chat in public - private voice chat for clans. Voice chat is only really benefitial if you wish to play seriously as a team or chat more freely with people you know... and if that's the case, you should join a [censored] clan instead of looking for that kind of experience on a public server with random strangers.
Exactly, if it's enabled, it's there to use, whether you like it or not.

Please don't tell me how to play my games. You play how you like, and I'll shall do the same. Don't like listening to people, find a quiet server. Don't order us to play by your rules, unless you own the server of course.
Disagree entirely. You can have conversations with strangers while playing a game, it's actually pretty interesting. And you can trash talk and just have a good time. Why wouldn't you? That's kind of what online gaming is all about.
Indeed. I've met a lot of people in online games, and been added to friends lists
because I talk, and help my team. We rib each other, talk about real life crap, whatever. It's a public server, full of regulars who like to talk. Just how I like it.
You can do that in text chat though. It's far less intrusive that way. People can join in with the banter when they like, or choose to ignore it entirely.
Again, voice chat is only really advantageous over text chat if:
- You're playing seriously as a team with lots of tactics involved (you should join a gaming clan if you're after teamwork; barking orders at random people who just want to mess around and play for fun doesn't work).
- Or if you want to have a lengthy conversation with someone you know, as you would over the phone (which random people shouldn't have to listen to).
.....in your opinion, which, in mine, your are wrong! Why take 30 seconds, stopping all other actions, to type what I can say in 3 seconds while continuing to kick ass? (Yeah, I svck at typing!

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Don't come to SourceOP Valve maps. You'll hate it when most of the regular talkers are on. Boy, would you love Dan.......or Duplex. HA! I can see you pulling your hair out already.....
Quiet teams are boring teams!