This excerpt from the Mclintock and Strong Biblical Encyclopedia should encapsulate all I have against Mary being so venerated/adored/worshipped.
"As mother of the Savior of the world," says Dr. Schaff (Ch. Hist. 2:410), "the Virgin Mary unquestionably holds forever a peculiar position among all women and in the history of redemption;" and, from this point of view, he remarks that it is "perfectly natural, nay, essential to sound religious feeling, to associate with Mary the fairest traits of maidenly and maternal character, and to revere her as the highest model of female purity, love, and piety.... But, on the other hand, it is equally unquestionable that she is nowhere in the N.T. excepted from the universal sinfulness and the universal need of redemption, nor represented as immaculately holy, or as in any way an object of divine veneration." Roman Catholics, however, have insisted upon the adoration, as they term worship in this instance, of the mother of Jesus, holding that Mary has been assumed in the Trinity, so as to make it a Quaternity; that "Mary is the complement of the Trinity" (Pusey, Eirenicon, 2:167), and that the intercession of Mary is needed for the salvation of the followers of Jesus Christ. We quote the words of Liguori himself: "We most readily admit that Jesus Christ is the only Mediator of Justice, and that by his merits he obtains us all grace and salvation; but we say that Mary is the Mediatrix of Grace; and that receiving all she obtains through Jesus Christ, and because she prays and asks for it in the name of Jesus Christ, yet all the same, whatever graces we receive, they come to us through her intercession"
(Glories of Mary, p. 124). There is certainly not a word in the Bible, nor in the creeds of the Apostolic Church, nor even in the writings of the Church fathers of the first five centuries, to warrant any Christian in assigning such a position to Mary, the mother of Jesus, as the Catholic Church, both Latin and Greek, has dared to bestow upon her. One of the accepted interpreters of the Church of Rome, Liguori, in commenting on the exalted position which the Virgin Mary should hold in the estimation of Latin communicants, says that she is Queen of Mercy (p. 13); that she is the Mother of all mankind (p. 23); that she offered her Son to the Father on Mount Calvary (p. 23); that she is especially the Mother of repentant sinners (p. 42); that she is our Life (p. 52); that God was reconciled with sinners by the humility and purity of Mary (p. 56); that she obtains us perseverance (p. 59); that she renders death sweet to her clients (p. 68); that she is our Protectress at the hour of death (p. 71); that she is the Hope of all (p. 79); that she is our only Refuge, Help, and Asylum (p. 81); that she is the Propitiatory of the whole world (p. 81); that she is the one City of Refuge (p. 89); that it is her office to withhold God's arm from chastising sinners until he is pacified (p. 93); that she is the Comfortress of the world, the Refuge of the unfortunate (p. 100); that we shall be heard more quickly if we call on the name of Mary than if we call on the name of Jesus (p. 106); that she is our Patroness (p. 106); that she is Queen of heaven and hell, of all saints, and all evil spirits, because she conquered the latter by her virtues, and the devil by her fair humility and holy life (p. 110); that she protects us from the divine justice and from the devil (p. 115); that at the name of Mary every knee bows and hell trembles (p. 116); that she is the Ladder of paradise, the Gate of heaven, the most true Mediatrix between God and man (p. 121); that her intercession is necessary for salvation (p. 122); that she is the Mediatrix of grace (p. 124); that in her is all hope of life and virtue, all grace of the Way and Truth (p. 125); that in her we find eternal salvation (p. 125); that no one can enter heaven except by her (p. 127); that all graces of the spiritual life are transmitted by Mary (p. 127); that all gifts, virtues, graces are dispensed by her, to whomsoever, when, and as she pleases (p. 128); that from her the world receives every good (p. 128); that she is the Helper of the Redemption (p. 133); that she and her Son redeemed the world (p. 133); that she is the Co-operator in our justification (p. 133); that the way of salvation is open to none otherwise than through Mary (p. 135); that God says, "Go to Mary," when we seek for grace from him (p. 136); that the salvation of all depends on the favor and protection of Mary (p. 136); that the other saints intercede with her (p. 138); that she is a tender Advocate; that all power is given unto her in heaven and earth (p. 145); that God obeys the command of Mary (p. 146); that Mary is omnipotent (p. 146); that the whole Church is under the dominion of Mary (p. 146); that what she wills is necessarily done (p. 147); that her prayers have something of a command in them (p. 151); that Jesus Christ is under an obligation to her to grant all she asks (p. 152); that she is the singular Refuge of the lost (p. 156); that she is the Advocate of the whole human race (p. 161); that her chief office in the world is to reconcile fallen souls with God (p. 167); that she is the great Peace-maker who obtains reconciliation, salvation, pardon, and mercy (p. 165); that in her is established the seat of God's government (p. 179); that she delivers her clients from hell (p. 183); that her clients will necessarily be saved (p. 184); that she has sent back many from hell to earth who have died of mortal sins (p. 188); that she consoles, relieves, and succors her clients in purgatory (p. 195); that she delivers her clients from purgatory by applying her merits (p. 195); that she carries away from purgatory all who wear the Carmelite scapulary on the Saturday after they die, provided they have been chaste and have said her office (p. 196); that she does not suffer those who die clothed in the scapulary to go to hell (p. 185); that Mary leads her servants to heaven (p. 198); that she has the key of the gate of paradise (p. 199); that she is the Way of our salvation (p. 200); that it is for the love of Mary and on account of her merits that God is more merciful under the New than under the Old Dispensation (p. 214); that her powerful intercession sustains the world (p. 214); that she is the Throne of grace to which St. Paul bids us fly (p. 215); that Christ has promised that all who invoke the holy name of Mary with confidence shall have perfect sorrow for their sins, atonement for their crimes, strength to attain perfection, and shall reach the glory of paradise (p. 226), etc.