Why pray the Rosary?

Im not surprised when I get negative responses to my videos from Protestants concerning my constant encouragement to pray the Rosary. I know that it is out of ignorance that they do so. Hopefully, this video will dispel some of that ignorance. But it baffles me when I get the same kind of resistance from Catholics, who should know better.

If our age in its pride laughs at and rejects Our Lady’s Rosary, a countless legion of the most saintly men of every age and of every condition have not only held it most dear and have most piously recited it but have also used it at all times as a most powerful weapon to overcome the devil, to preserve the purity of their lives, to acquire virtue more zealously, in a word, to promote peace among men.”

Now I didn't say that either.
-Pope Pius XI did.