As a cybran player I go quite heavy on the T1 maa. I tend to mix up the build order on different facs. A few facs would be spamming 6 mantis and 1 mole, others would be spamming an arty and a maa on repeat, depending on what my opponent seems to be doing.
In any case, the fact that my aa can shoot ground makes it worthwhile and there is usually some aa around to deal with remote bomber attacks and if not they can be parked off taking out enemy mexes or just acting as fodder to soak up fire away from my tanks and arty. They are even good enough to take down T2 gunships if present in fairly modest numbers.
It works well, so far. The change from vanilla where you don't have to toggle fire mode is a godsend. I'd have to say that cybran t1 maa has kept me from learning how to spam interceptors