If the priest uses water, at least pours the water over the subject's forehead, and pronounces the words of the form of the sacrament, (in English, the words) "I baptize you (or he could say the person's name) in the Name of the Father, and of the Son, and of the Holy Spirit (or Holy Ghost)," and demonstrated that he has the intention of doing as the Church does, that is, remove original sin and make the person a Christian.
All of my children were baptized using the Novus Ordo rite. Each priest used water, poured the water over the child's forehead, and spoke the correct words. Further, each priest did talk about removing original sin by the baptism. I have no reason to suspect that the Conciliar priest did not have the intention of doing as the Church does in this sacrament.
I have discussed this issue with traditional priests and all of them have told me that if I do not have a positive reason to suspect the baptisms to be invalid, then validity must be presumed.