The Church initially debunked Lourdes and Fatima, and St. Bernadette and the Fatima children suffered personal persecutions as a result.
Whether Mrs. Lueken's visions are authentic or not--and that's not for me to say--we have to look to the results generated: more Catholics are praying the Rosary and wearing their sacramentals. That's the last thing the Devil would want.
One thing is true: the Church has tolerated corruption for far too long, and now Pope Benedict has his hands full throwing the moneychangers out of the Lord's temple.
When I went to Catechism back in the 60's, some San Francisco bishop announced that teaching the Rosary was old fashioned and unnecessary. As a result we never learned how to pray it. I didn't learn how to pray the Rosary until I was an adult and found tldm.org.
But we are nonetheless bound to obey the Church. And the Church has declared the visions inauthentic, and so it stands.
And it's not just a question of obedience -- the folks connected with Bayside are promulgating all sorts of nonsense, to-wit:
The "messages" and other related propaganda contain statements which, among other things, are contrary to the teachings of the Catholic Church, undermine the legitimate authority of bishops and councils and instill doubts in the minds of the faithful, for example, by claiming that, for years, an "imposter (sic) Pope" governed the Catholic Church in place of Paul VI.
I'm big on obedience, because I used to be an Episcopalian and I've seen where disobedience takes you.