Having played around a (very small) bit with running MAc builds in 0.9.9.3, I have a suspicion that on ITYTD, not only is MAc no longer the lowest-skill-required master trait build (MAD builds are less demanding to play, especially if you start off TaNx2 Bad), I'm not even convinced it has a lower skill requirement than MVm.
How's it holding up at the higher difficulties where health isn't in such ridiculously profuse supply?