From the Berliner Morgenpost, which rounded up opinions expressed by several sources:
Church critic and Tübingen theologian Hans Küng spoke of [the appointment as Prefect of the Congregation for the Doctrine of the Faith] as a "disastrous miscast."...Müller - a native of Mainz - was, since 2002, the shepherd of the diocese of Regensburg. The 64-year-old is highly regarded among theologians. He is also a hardliner on the clergy. He has often attacked church critics with sharp words. "I am not addicted to conflict - but not addicted to harmony, either," he once said....The German Conference of Catholic Bishops (DBK) announced to be "very pleased" with the pope's decision. "The German Conference of Bishops is proud that one of its members will be in charge of this important task in the Roman Curia," said DBK Chairman and Freiburg Archbishop Robert Zollitsch. Müller is one of the "most distinguished theologians of our time." ...On the other hand, Catholic theologian Hans Küng in Tübingen spoke on Müller calling the appointment, "as prefect of the Congregation, of narrow-minded agitators is out of place." ... "With Müller's appointment, conflicts in the Roman Curia and within the scandal-ridden Church are preset." ...Alois Glück, Chairman of the Central Committee of German Catholics (ZdK), spoke up against criticism of Müller. "Bishop Müller is a world-renowned theologian with a much wider range of opinion than suggested by many," Glück said. "He is deeply committed to ensuring that the Church cares about social justice."...The lay movement "We Are Church" wished Müller "God's blessing" in his new task, but declared that his Regensburg time made for a bad precedent: "With the dismissal and exclusion of elected lay people from diocesan bodies, and the strict discipline regarding critical priests, he promptly established a climate of fear and servility in his diocese," "We Are Church" said in their message.