Ive played Madness for PVP and PVE and i must say that i really love the root/dot it has. The rotation really isn't as difficult as people say and defiantly isn't harder than deception except that you have use Death field properly(meaning not break ccs etc) ALso the fact that you have to first aim death field AND then click might waste some time. A dislike i had with Madness is that you have to watch your buffs to know when you can instant cast your Crushing Darkness. I guess same could be said about deception with Exploit Weakness. However, an easy fix to this would be to make the ability light up when either one of those occur. As far as what spec is better id say that they are very much equal and that it really comes down to what the individualize likes.

I agree, however its doable but only if everyone in the group is a tank =P