Jesus is our Savior, why give Our Lady all this attention?
This is actually more of a Catholic Faith question than a Medjugorje questions but I will try to give a simple answer. This could be a very long discussion but I think sticking to the simplistic reality of Our Lady's role in the Church is enough.
Some other faiths contend that Catholics worship Mary, or at the very least, give too much attention to Mary. If one excludes Mary, the mother of God, from their faith, then they are making a great mistake. The Catholic Faith believes that Our Lady is mediatrix of all graces and her role has always been to lead people to her Son Jesus.
It is a fact that for the first 1500 years after the start of Christianity, Mary was very deeply revered and respected. The loss of this devotion among Christians has occurred primarily since the Reformation period (1500's), which is somewhat ironic since Martin Luther, himself, had a special devotion to Mary. In scripture we find that Mary prophesied herself, "All ages to come shall call me blessed." Mary is a special instrument in God's plan. While she is not to be worshipped, she is "blessed," and she deserves great respect for the role she played in our salvation by being the human tabernacle of Christ. She is a great model for all of us to follow. (This paragraph taken from http://www-cs-students.stanford.edu/~marco/medjugorje/ )
Our Lady's message in Medjugorje supports her role in the Church, and coincidentally is virtually the same message proclaimed by John the Baptist. Just as John's message, Our Lady points the way to her Son Jesus, and implores us to "repent", to change our lives to lives with God as our focus and core. It is interesting that Our Lady's first appearance in Medjugorje was on June 24, 1981, the feast of John the Baptist.