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.
Why is trash talk the "point" of online gaming? I Play online gaming because it's generally a more immersive experience. Note that I"m referring specifically to MMOs and the like, I despise any and all FPS games(just really dislike the genre to be honest). I don't want to trash talk or be trash talked to, it just pisses me off and makes me want to reach through my screen, into their room and smack some sense into them. There is no point to Trash talk. It's not funny, it's not engaging, it's not rewarding, it's not fun, it's not cool, it's not anything positive. It is however, demeaning, immature, childish and over-all stupid. On top of that, it's what is holding back gamers as being an actual recognized culture in the world at large, because when people trash talk constantly, it makes people take us a lot less seriously.
edit: To address the original question: I dislike mic chat. I've never used it, and never plan on ever touching it. For one thing, I don't do online gaming on a console. For another, if I wanted to hear other people talk, I'd be out in the real world doing something with friends. I play games to relax, and I can't relax while listening to random peoples pvssyr, even if it's fairly sane, normal pvssyr.