There is a buff to madness, L2read. Madness is fine.
These changes on Wrath are maybe a buff. But not Polarity Shift, this is a must done much earlier and is coming very late as change. The rest is going for Lightning and a little bit for Healers.
In fact for Madness is more in need, in hard more for the Force-Issue, as long as Crushing Darkness and Lightning Strike cost much force. In fact to make this a good buff there must be more a change to make both Casts for free or less force-cost.
If this change on wrath makes it possible that i can cast both skills more than now, yeah its a buff. If not it won't be a buff.