[fwdude]

Then how “orthodox” is the Rosary considered in Catholicism?

Mary is mentioned almost constantly in that recitation.

[Salvation]

Actually only two mysteries are about Mary

Let’s take a look

Joyful Mysteries — Conception, birth and childhood of Jesus Christ

Luminous Mysteries — the Adult Ministry of Jesus Christ from his Baptism to the Last Supper

Sorrowful Mysteries — from the Agony in the Garden to the Crucifixion

Glorious Mysteries — first three — Resurrection, Ascension, Descent of the Holy Spirit, then the two about Mary

So you see the Rosary is really about Christ.

While we say it we meditate on these incidents in his life.