Is it required that Catholics be devoted to Mary?
Devotion is an emotional attachment, which cannot be required of anyone. All that is required is assent to those doctrines that the Church has declared to be true and binding upon Catholic consciences. As long as a Catholic gives assent of the will to the Marian doctrines, it is not required that he have any particular emotional attachment to the Blessed Mother.
That said, devotion can be developed just like emotional attachment to any person can be developed, and it is a pious action for a Catholic to develop a devotion to his spiritual Mother. One means of developing such an attachment is to learn more about the Blessed Mother through reading Marian apologetic and devotional literature.