http://www.torhead.com/skill-calc#2000cZhMbZfMforbkrfz.1
Hopefull that shows up not sure if it is going to work.
But I have been using this 3/7/31 build and have noticed its a GREAT build i win most of my 1 on 1 duels vs anything but a healer and the build is designed mostly for stressing healers. get all three dots on your main target then start spreading dots around and mauling alot.
The entire idea of madness in pvp is to create "Madness" for healing it spreads the need of heals as some of these dots such as crushing darkness hit hard and forces healers to spread more healing.
Its much the same idea of a warlock in World of Warcraft.
So YES ... Madness IS a competative spec.
I average just as much or more damage done than both other specs. No I am not as capable of a ball carrier.