I made a mod that i play tested in single play called KOA. It beefs MA Man up a tad, but not too terribly much. It moves them from the bottom towards the middle, but in no way near the top.
And it does make Man much more fun to play. I am going to put a link for it in the mods forum after this post. I would love to see it tested in mp.
But I had my hands full playing Man with the mod with jotunheim on ai, so it is NOT overpowered.
I meant to start a MA game to test Throne of Heroes and the Kingdom of Avalon mod(Ma Man) this fall, but Kingmaker has taken its toll on me and I am taking a break from mp after it is done. But if I can do anything to talk you into playing MA Man with the mod let me know.
If not, i understand and I will one day start a similar game and try and twist KO's arm to play MA Man with the mod.