The audio preview is horrible. Not enough delay between words. My comments are well thought out, but they sound moronic when I use Audio Preview.
BTW, I'm not sure if this was just a coincidence, but a week or so ago the popular web-comic "xkcd" published a strip about writing a virus to force people to listen to their comments on YT before posting in hopes of weeding out the "moronic" comments. :)
Perhaps hearing your computer boomerang the nasty words back in your face might give you an idea of how they might sound to other people, thus giving you a moment of reconsideration and second thought. It's anger management. I don't know, really; I am not worthy.