Easy's relative. In the pregame lobby, it's fairly straightforward. When you're in the thick of matchmaking, who has time to take a minute to button through several menus just to scroll through the players list to get your guy. I've been sodomized several times in the attempt.
This new button simply eliminates pausing and all the menus. The "a-hole" button, despite Bungies "we shit it, so it's AWESOME", still takes you out of the action while your defenseless spartan/elite remains in it as you search for the loud-mouth to mute.
In the mean time, I'll just keep fighting fire with fire and perfect my explitive combination strings- which is really half the fun of Halo 2 matchmaking on Live these days anyway.