I am Catholic....and a devout traditionalist....I am on my way to Orthodoxy so this means very little to me now, but I could never attend a NO mass, they are truly un-Catholic in my opinion, however I do believe they are valid.
Below I have included a few comon responses you will hear from Roman Catholic Latin Mass Traditionalists when asked why they refuse to attend the NO:
Because the New Mass is not an unequivocal Profession of Catholic faith (which the Traditional Mass is), it is ambiguous and Protestant. Therefore, since we pray as we believe, it follows that we cannot pray with the New Mass in Protestant fashion and still believe as Catholics!
Because the changes were not just slight ones but actually "deal with a fundamental renovation...a total change...a new creation" (Msgr. A. Bugnini, co-author of the New Mass).
Because the New Mass leads us to think "that truths...can be changed or ignored without infidelity to that sacred deposit of doctrine to which the Catholic Faith is bound forever."
Because the New Mass represents "a striking departure from the Catholic theology of the Mass formulated in Session XXII of the Council of Trent" which, in fixing the "canons," provided an "insurmountable barrier to any heresy against the integrity of the Mystery."
Because in times of confusion such as now, we are guided by the words of Our Lord: "By their fruits you shall know them." Fruits of the New Mass are: 30% decrease in Sunday Mass in U.S. (NY Times 5/24/75), 43% decrease in France (Cardinal Marty), 50% decrease in Holland (NY Times 1/5/76).
Because in less than seven years after the introduction of the New Mass, priests in the world decreased from 413,438 to 243,307 -- almost 50% (Holy See Statistics).
Because the New Mass confuses the REAL Presence of Christ in the Eucharist with His MYSTICAL Presence among us (proximating Protestant doctrine).
Because the New Mass blurs what ought to be a sharp difference between the HIERARCHIC Priesthood and the common priesthood of the people (as does Protestantism).
Because the New Mass favors the heretical theory that it is THE FAITH of the people and not THE WORDS OF THE PRIEST which makes Christ present in the Eucharist.
Because the New Mass does away with the Confiteor of the priest, makes it collective with the people, thus promoting Luther's refusal to accept the Catholic teaching that the priest is judge, witness and intercessor with God.
Because the New Mass gives us to understand that the people concelebrate with the priest -- which is against Catholic theology!
Because six Protestant ministers collaborated in making up the New Mass (Drs. George, Jasper, Shepherd, Kunneth, Smith and Thurian).
Because just as Luther did away with the Offertory -- since it very clearly expressed the sacrificial, propitiatory character of the Mass -- so also the New Mass did away with it, reducing it to a simple Preparation of the Gifts.
Because enough Catholic theology has been removed that Protestants can, while keeping their antipathy for the true Roman Catholic Church, use the text of the New Mass without difficulty. Protestant minister Thurian said that a fruit of the New Mass "will perhaps be that non-Catholic communities will be able to celebrate the Lord's Supper using the same prayers as the Catholic Church." (La Croix 4/30/69).
Because the narrative manner of the Consecration in the New Mass infers that it is only a memorial and not a true sacrifice (Protestant thesis).
Because the changes such as: table instead of altar, facing people instead of tabernacle, Communion in the hand, etc., emphasize Protestant doctrines (e.g. Mass is only a meal, priest is only apresident of the assembly, etc.).
Because Protestants themselves have said "the new Catholic Eucharistic Prayers have abandoned the false perspective of sacrifice offered to God." (La Croix 12/10/69).
Because the New Mass was made in accordance with the Protestant definition of the Mass: "The Lord's Supper or Mass is a sacred synaxis or assembly of the people of God which gathers together under the presidence of the priest to celebrate the memorial of the Lord" (Par. 7 Introd. to the New Missal, defining the New Mass, 4/6/69).
Because beautiful, familiar Catholic hymns which have inspired people for centuries have been thrown out and replaced with new hymns strongly Protestant in sentiment, further deepening the already distinct impression that one is no longer attending a Catholic function.
Because Holy Mother Church canonized numerous English martyrs who were killed because they refused to participate at a Mass such as the New Mass!
Because Protestants who once converted to Catholicism are scandalized to see that the New Mass is the same as the one they attended as Protestants. One of them, Julian Green, asks, "Why did we convert?"
Because the traditional Mass has forged many saints. "Innumerable saints have been fed abundantly with the proper piety towards God by it..." (Pope Paul VI, Const. Apost. Missale Romanum)
Because the New Mass has eliminated such things as: genuflections (only three remain), purifications of the priest's fingers in the chalice, preservation from all profane contact of the priest's fingers after Consecration, sacred altar stone and relics, three altar cloths (reduced to one), all of which "only serve to emphasize how outrageously faith in the dogma of the Real Presence is implicitly repudiated."*
Because along with the New Mass goes also a new catechism, a new morality, new prayers, new ideas, a new calendar -- in one word, a New Church, a complete revolution from the old. "The liturgical reform...do not be deceived, this is where the revolution begins." (Msgr. Dwyer, Archbishop of Birmingham, spokesman of the Episcopal Synod.)
Because the New Mass embodies numerous errors condemned dogmatically at the Council of Trent (Mass totally in vernacular, words of Consecration spoken aloud, etc. See Condemnation of Jansenist Synod of Pistoia), and errors condemned by Pope Pius XII (e.g. altar in form of a table. See Mediator Dei.)
Because the altar and tabernacle are now separated, thus marking a division between Christ in His-priest-and-Sacrifice-on-the-altar, from Christ in His Real Presence in the tabernacle, "two things that of their very nature must remain together." (Pope Pius XII)
Because the New Mass no longer constitutes a vertical worship from man to God, but instead a horizontal worship between man and man.
Because the New Mass, although appearing to conform to the dispositions of Vatican Council II, in reality opposes its instructions, since the Council declared its desire to conserve and promote the traditional rite.
Because the traditional Latin Mass of Pope St. Pius V has never been legally abrogated and therefore remains a true rite of the Catholic Church by which Catholics may fulfill their Sunday obligation.
Because Pope St. Pius V granted a perpetual indult, valid "for always," to celebrate the traditional Mass freely, licitly, without scruple of conscience, punishment, sentence or censure" (Papal Bull "Quo Primum").
Because Pope Paul VI, when promulgating the New Mass, himself declared, "The rite...by itself is NOT a dogmatic definition..." (11/19/69)
But as I said...the NO and the Tridentine Masses have little importance to me since I am on my way to Orthodoxy, I thought I'd just post this to give an idea of why exactly Latin Mass Catholics, such as myself, do not attend the NO.
Thanks and God bless