It is a grand temple, built according to shilpa shastras, dedicated primarily to Goddess Meenakshi, the eternal ruler of Madurai. She reigns supreme from the inner garbhagriham (the sanctum sanctorum) of the temple. She is the one worthiest of worship. For most people, she alone would have been enough. Hindus are not most people. Just because Meenakshi herself is there, it doesn’t mean other goddesses occupying less-significant places like the outer walls are ignored.
Hindu gods are many. Hindu bhakti is inexhaustible. Hindus, as is well known, know no reticence.