Example of Changes:
Old Rite
S: I confess to Almighty God, to Blessed Mary ever Virgin, to Blessed Michael the Archangel, to Blessed John the Baptist, to the Holy Apostles Peter and Paul, to all the angels and Saints, and to you father: that I have sinned exceedingly, in thought and deed: through my fault, through my fault, through my most grievous fault. Therefore I beseech the Blessed Mary ever Virgin, Blessed Michael the Archangel, Blessed John the Baptist, the Holy Apostles Peter and Paul, all the Saints, and you, Father, to pray for me to the Lord our God.
P: Almighty God have mercy on you, and forgiving you your sins, bring you to life everlasting.
S: Amen.
New Mass:
I confess to almighty God and to you, my brothers and sisters, that I have greatly sinned in my thoughts and in my words,in what I have done and in what I have failed to do, [All strike their breast thrice] through my fault, through my fault, through my most grievous fault; therefore I ask blessed Mary ever-Virgin, all the Angels and Saints, and you, my brothers and sisters,to pray for me to the Lord our God.
Now, one might think that the new Mass prayer is better for various reasons (boiling down to what one might find in the Urban Dictionary,) but it doesn’t represent the prayer contained in the Deposit of the Faith.
Try to imagine how much difference exists in the Confiteor prayer and apply that to the entire Mass and indeed the teachings of the Catholic Church and you can see why Traditionalists believe that Paul VI created a new Religion.