First of all, I would like to suggest adding Ranger to the selectable classes for MA. I know it is a mage/thief faction, but there are a great number of outdoor areas near the mystic city of Garagoth, so rangers wandering those plains would only be natural. Also, a thing I've noticed is that both AO and RK have them (I dont see the logical reason why RK do when SL don't to be honest, as both are cavedwelling factions).
Another idea I've had is to allow CG characters to join MA, which would solve the problem with the good-aligned wizards pretty much. Also, adding Mystra, Oghma and perhaps a 3rd neutral or good aligned mage deity would make sense. Allowing more wizardry than just the dark part of it, kinda like the Bahamut/Tiamat "conflict" in AO.
Having both good and evil aligned mages in the same faction would be great for RPing, imagine the mage duels that would take place


I also see the lack of domains as a slight problem, I think the wastes of angmar should be enough to allow the Sun domain, and since Garagoth has connections to the planar activity then i think the four elemental domains would be suitable aswell.
That's all for now /arvut