The women who came a spoke were very nice and kind, I do think they were sincere. However, the ways in which they spoke of Mary was toeing the line: suggesting that she was higher or some how more worthy than Christ.
St. Maximilian Kolbe is quoted on the front cover of their pamphlet: To lead every individual with Mary to the Sacred Heart of Jesus. I find it very unique that the Saint proposes that we are not lead to Mary, but with Mary to Christ Jesus. This suggests that we all implore and praise God alone.
To directly quote the MI as to their purpose:
[...] is a worldwide evangelizations movement founded by St. Maximillian Kolbe in 1917. It encourages a total consecration to Mary Immaculate as a means of spiritual renewal for individuals and society.
Marian consecration in the MI is a formal act of self-giving that does not stop at Mary, but is Christ-directed. It is really a consecration to Jesus. [...]
The MI employs prayer as the main weapon in the spiritual battle with evil. MIs also immerse themselves in apostolic initiatives throughout society, either individually or in groups, to deepen the knowledge of the Gospel and our Catholic Faith in themselves and others.
By joining the MI, members become willing instruments of Our Lady, the handmaid of the Lord and the immaculate instrument of God. You become a member of an international movement sharing in the maternal mission of Mary, the conversion and sanctification of all souls. The goals of the MI are personal sanctification, the conversion of the world, and ultimately the universal reign of the Sacred Heart of Jesus.
The MI is one of the few Vatican-approved public associations whose mission, like that of the Cathlic Church, is universal. Although the MI is open to Catholics only, it encourages all people of good will to develop a trusting relationship with our Lady.
I have an issue with "members become willing instruments of Our Lady." It is St. Francis of Assissi who tells us to be instrument of our Lord, not Mary. Just as we are like clay in the hands of the Lord, so too are we to be used by the Lord for the fulfillment of His will (Jer. 18:6).
I want to make clear that not in any way am I saying that the whole of the MI is wrong, but that some members may enjoin themselves so close to Mary that they don't look beyound her. I know that we need to honor Mary and love her as our Lord's Mother. However I want to caution the thought that without Mary's "yes" there would be no salvation in Christ on the Cross. I think that honor and praise of Mary could literally turn into worship of Mary if one begins to think that Mary is the source of Christ (per His conception and birth) and hence salvation would come from her.