She became the Mother of God, in which work so many and such great good things are bestowed on her as pass man’s understanding. For on this there follows all honor, all blessedness, and her unique place in the whole of mankind, among which she has no equal, namely, that she had a child by the Father in heaven, and such a Child . . . Hence men have crowded all her glory into a single word, calling her the Mother of God . . . None can say of her nor announce to her greater things, even though he had as many tongues as the earth possesses flowers and blades of grass: the sky, stars; and the sea, grains of sand. It needs to be pondered in the heart what it means to be the Mother of God.
(Commentary on the Magnificat, 1521; in Luther’s Works, Pelikan et al, vol. 21, 326)
Thank God he did.
But regardless of adjectives, neither Luther nor Calvin attributed to Mary any of the sacrilegious, supernatural powers the RCC cons the world with today.
Therefore we should make the Hail Mary neither a prayer nor an invocation because it is improper to interpret the words beyond what they mean in themselves and beyond the meaning given them by the Holy Spirit.[100]
her giving birth is blessed in that it was spared the curse upon all children of Eve who are conceived in sin and born to deserve death and damnation. Only the fruit of her body is blessed, and through this birth we are all blessed.[101]
in the present no one speaks evil of this Mother and her Fruit as much as those who bless her with many rosaries and constantly mouth the Hail Mary. These, more than any others, speak evil against Christs word and faith in the worst way.[102]
Therefore, notice that this Mother and her Fruit are blessed in a twofold waybodily and spiritually. Bodily with lips and the words of the Hail Mary; such persons blaspheme and speak evil of her most dangerously. And spiritually [one blesses her] in ones heart by praise and benediction for her child, Christfor all his words, deeds, and sufferings. And no one does this except he who has the true Christian faith because without such faith no heart is good but is by nature stuffed full of evil speech and blasphemy against God and all his saints.[103]
These quotes are from Luthers brief explanation of the Hail Mary found in Luthers Personal Prayer Book. http://tquid.sharpens.org/luther_mary2.htm#VII