The following link has some information on Vamachara Marga from Advaitic view point.

http://www.ambaa.org/archives/frm03286.html

Shankaracharya has clearly condemned this unVedic pratice according to couple of Shankara Vijayas.

http://www.geocities.com/advaitavedant/shankarabio.htm

This is a presentation of his life based on Anandagiri's Shankara Vijaya, Maadhaveeya Shankara Vijaya and works by Swami Apoorvananda.

At Tulaja Bhavani, there lived many Shakta followers of Vamachara. Many of them indulged in practices like Narabali and Yoni Puja. These so called Shaktas indulged in the name of religion, in meat, wine and women and had thus considerably sullied the moral life of society. As a result of their diabolical rituals, people were misled to indulge in many evil practices. The Acharya knew this and therefore decided upon reforming these Vamachara tantrics.
One day during his stay at Tulaja Bhavani, some Vamacharis came to the Acharya and began to abuse him as a hypocritical ascetic. Explaining their own view they said, " The primal source of the world is Shakti and it is her that we worship. There is no importance of your Advaita knowledge whatsoever. You too should follow this creed. This will bring you supreme good".
The Acharya listened to their arguments patiently. Then he said, " There can be no deliverance through senseless rituals by which you claim to please Shakti. In the scriptures it is written that one should never take to meat and wine. By taking meat and wine, you have lowered yourselves. You have stayed away from the region of the Brahman. Do not call yourselves Shaktas any more. Try for deliverance from sins through atonement and by surrendering yourselves to the supreme Brahman".
The followers of Vamachara were filled with self-remorse at these words of the Acharya, full of substance and quite in accordance with the scriptures. The Acharya initiated them into Samayachara worship of the great Goddess and showed them the proper way to attain self- realization. His invaluable works like Prapanchasara Tantra, Tantravatarakrama and the Saundaryalahari acted as guides to the path of liberation by way of worship of the supreme Parashakti , at the same time following the rules laid down in the Vedas.
Here is what Vivekananda says about vamachara marga.

http://www.vivekananda.btinternet.co.uk/veda11.htm

Vol.3: The Vedanta in All Its Phases, pp.340-341.

When I see how much the Vamachara [Tantra] has entered our [Bengali] society, I find it a most disgraceful place, with all of its boast of culture. These Vamachara sects are honeycombing our society in Bengal. Those who come out in the daytime and preach most loudly about achara, it is they who carry on the horrible debauchery at night and are backed by the most dreadful books. They are ordered by the books to do these things. You who are of Bengal know of it. The Bengal Shastras are the Vamachara Tantras. They are published by the cart-load, and you poison the minds of your children with them instead of teaching them our Shrutis. Fathers of Calcutta, do you not feel ashamed that such horrible stuff as these Vamachara Tantras, with translations too, should be put into the hands of your boys and girls, and their minds poisoned, and that they should be brought up with the idea that these are the Shastras of the Hindus? If you are ashamed, take them away from your children and let them read the true Shastras - the Vedas, the Gita and the Upanishads.