[Burke:] Pope Benedict XVI manifested the legacy of his teaching on the Sacred Liturgy in a remarkable manner by his Apostolic Letter, given motu proprio, Summorum Pontificum of July 7, 2007, and the subsequent legislation for its implementation, the Instruction Universae Ecclesiae of the Pontifical Commission Ecclesia Dei. Sadly, after the Second Vatican Ecumenical Council, many abuses in the celebration of the Sacred Liturgy took place. Pope Benedict XVI made explicit reference to the situation in his Letter to the Bishops of the world, at the time of the promulgation of the Apostolic Letter. Writing about the desire of some of the faithful for the form of the Sacred Liturgy existing before the post-Conciliar reforms, he affirmed:full article at New Liturgical Movement
Many people who clearly accepted the binding character of the Second Vatican Council, and were faithful to the Pope and the Bishops, nonetheless also desired to recover the form of the sacred liturgy that was dear to them. This occurred above all because in many places celebrations were not faithful to the prescriptions of the new Missal, but the latter actually was understood as authorizing or even requiring creativity, which frequently led to deformations of the liturgy which were hard to bear. I am speaking from experience, since I too lived through that period with all its hopes and its confusion. And I have seen how arbitrary deformations of the liturgy caused deep pain to individuals totally rooted in the faith of the Church.
There is no doubt that, at the time of the post-Conciliar reform of the Sacred Liturgy, in many placesthere was a lack of liturgical discipline, and many abuses were introduced which led the faithful to believe that the Church had abandoned her theocentric liturgical tradition and embraced a totally new anthropocentric approach. From my own experience, as a seminarian during the years of the implementation of the reform mandated by the Council, I, too, can say that the infidelity to the reform gave place to liturgical aberrations which were indeed difficult to bear and were profoundly harmful to the Catholic faith and its practice.