Answer to 1: It is rare for people to use in-game voice chat in pubs. If you don't hear it, its not going on; I believe the mic thing beside peoples names in the tab menu is either meaningless or so vague it is meaningless.
Answer to 2: Lazors lazors lazors lazors lazors lazors
Answer to 3: To be honest, in both TSA and TC, they are situational. I stopped using them mostly because they are ineffective in taking out more than one target, which doesn't work well once you know what your doing. I do, however, find it a major bummer when I just gunned down a novacat, a bushwhacker, and a Raven in my Thanny only to get steamrolled by a Vulture because it is both too fast for me to escape and shakes the fapp out of my cockpit so I can't defend myself. Use what you need to use, though. If you want to be a super-good sport, don't take them.