As I understand it, apparitions such as the Virgin of Guadalupe are interpreted as appearances of the one true Virgin Mary, not as separate entities. As such, they are worthy of celebration, but not adoration. Mary, the divine being, is to be adored. Her appearance at a particular place and time is to be celebrated.

In any religious belief system, not just Catholicism, if an apparition or manifestation supplants the underlying divine concept, it's a step away from healthy spirituality and toward superstition. It amounts to worshiping the flagpole and ignoring the flag.