Well, the prayers that Blogger posted all show a theme. Even from the first one we DO see a fundamental problem:
Mary, Help of Those in Need
Holy Mary, help those in need, give strength to the weak, comfort the sorrowful, pray for God's people, assist the clergy, intercede for religious. Mary all who seek your help experience your unfailing protection. Amen.
Here we have a list of different tasks being asked of Mary. One of the many is to pray for God's people. But that is what you tell us is your entire request of Mary, to pray for us. This obviously does not match. Helping, giving, comforting, praying, assisting, and interceding are all listed as separate requests. Just this one example, among the others Blogger cited, and still hundreds more that are out there, I'm sure, tell us that there is MUCH more going on here than the simple solicitation to Mary to pray for us.
The last thing in the world I think of when reading these prayers to Mary is mediation. These are action requests. "Mary, do this for me now", etc. When I ask my friend for prayer I do not say "Steve, give strength to the weak, and I experience your protection of me." After reading the prayers that Blogger posted, that comparison is now officially COMPLETELY out the window as far as I'm concerned. (Thank you, Blogger :)
That should be intercession.
Yes, but the requests are not such that only Christ can give. Most certainly your friend Steve can give you strength, and protect you, and if he does, you will experience it. The point remains that nothing the saints do for us comes from their putative divinity.