The legacy of Pope Benedict XVI cannot be measured merely by his nearly seven year papacy, it must be measured by his entire priesthood culminating in being first named the Prefect of the Congregation of the Doctrine of the Faith where he came to be known as "God's Rottweiler" for disciplining errant theologians like Fathers Hans Kung and Edward Schillebeeckx and many others who promoted theologies of Christ, the Church and salvation that were falsifications and fabrications that all had a deleterious effect on the revised Catholic Mass. Cardinal Ratzinger's naming these theologies and theologians for what they were and are has earned him their scorn as well as the scorn of the progressive wing of the Church that sought to deconstruct and re-imagine the Church, in other words to do away with the true Church with which Vatican II was actually in continuity.
I have read where Cardinal Ratzinger said this, but I have also read a speech he gave to traditionalists in the late 1990's that if the Post Vatican II Sung Mass were celebrated in Latin, strictly following its rubrics and ad orientem, that most laity would not be able to detect the difference between the older and newer forms of the Holy Mass.
I think what Cardinal Ratzinger was decrying was not so much the post-Vatican II Mass, but theology about it that was a fabrication or falsification. The following is what I would deduce Cardinal Ratzinger meant, but I am open to correction and I have no footnotes to qualify what I am writing as being attributed to the then cardinal.
1. The emphasis of the Mass as a meal rather than the "re-presentation of Calvary in an un-bloody way": what this does is to impact not only the style of the celebration of the OF Mass, but its architecture and orientation of the people and non-rubric manipulation of the Eucharistic Prayer. The altar is stripped, made to look like someone's dining room table; the altar is thrust into the nave of the church so people can be seated around it and enjoy seeing each other and the priest at the consecration gestures with the bread and chalice of wine toward the people as though they are at the Last Supper just like the apostles--a literal enactment not of Calvary but of Holy Thursday's "fellowship meal." That is a fabrication and falsification of the Mass! But with that said, once the "re-presentation of Calvary in an un-bloody way occurs during the Canon" the Rite of Holy Communion is a "meal" in the sense of Christ bringing us into union with Himself through our worthy reception of Holy Communion, bringing us all the merits that He has won for us in becoming the Sacrificial Victim. In other words it is not a "fellowship meal" like Christmas dinner at home or worse yet a "McDonald's Happy Meal."
2. Low Church and Low Christology as it concerns Catholic doctrine and dogma about the Church and about Christ. Some theology of the Church and of Christ in the 1960's and 70's made Jesus just a good buddy and de-emphasized His divinity. The Church too was turned into a merely human institution devoid of divinity. This of course is a fabrication and falsification of the Mass, but certainly not intended by Pope Paul VI who approved the revised Mass. The way this fabrication and falsification manifests itself is through the demand that the communicant like the priest (because of the false and fabricated theology that there is no difference between the two) stand where kneeling was once prescribed, such as during the Canon of the Mass and at the reception of Holy Communion and that the communicant take the consecrated Host in his hand rather than on the tongue.
3. False theology of ecumenism is another falsification as well as fabrication that had a deleterious effect on the Mass. Intercommunion, the stripping of the traditional accoutrements of the Catholic Churches, the shunting of the tabernacle outside of the sight line of the nave all appeared as a dethronement of Jesus Christ and a lowering of His divine status (low Christology). Catholic Churches began to look more like Protestant Churches to emphasize the hope that all would be one one day. But true unity does not come about by selling out our Catholic identity or fabricating and falsifying a new one.
Just some thoughts.
My last comment pertains to the revised Mass. If celebrated according to the mind of the Church, meaning following the General Instruction and all the rubrics and using good liturgical music, there is no falsification or fabrication. We merely need to recover some things, like the traditional orientation of the Catholic sanctuary and kneeling for Holy Communion. Those two things alone would solve many problems associated with fabrication and falsification. The Mass itself is not that, a false and fabricated theology imposed upon it is.