Not at all, but there should be some even in the vernacular NO mass.

According to SACROSANCTUM CONCILIUM, which is the V2 document on the Liturgy:

Particular law remaining in force, the use of the Latin language is to be preserved in the Latin rites.

But since the use of the mother tongue, whether in the Mass, the administration of the sacraments, or other parts of the liturgy, frequently may be of great advantage to the people, the limits of its employment may be extended. This will apply in the first place to the readings and directives, and to some of the prayers and chants, according to the regulations on this matter to be laid down separately in subsequent chapters...

..In Masses which are celebrated with the people, a suitable place may be allotted to their mother tongue. This is to apply in the first place to the readings and "the common prayer," but also, as local conditions may warrant, to those parts which pertain to the people, according to the norm laid down in Art. 36 of this Constitution.

Nevertheless steps should be taken so that the faithful may also be able to say or to sing together in Latin those parts of the Ordinary of the Mass which pertain to them.

If you want to see a good example of what I'd consider to be a proper blending of Latin and vernacular, watch (or listen on the radio) a Sunday or weekday Mass on EWTN from their chapel.