Like the Roman Catholics, the Orthodox pray to Mary. The Catholics pray to "saints" and so do the Orthodox. The former bow to statues, and the latter to icons (flat images).Religiosity is not relationship.
I have many born again Greek friends who came out of the Orthodox church once they were saved by grace through faith in Jesus Christ, and especially after being baptized in the Holy Spirit. They could no longer remain in a dead church.
B. H. Clendennen, a classical pentecostal preacher & founder of the School of Christ International, said that the biggest enemies of the underground church in Russia were not Russian police or government soldiers, but the Orthodox church prelates who vigorously persecuted those who preached the full Gospel.
Respectfully, as an Orthodox Christian, this is incorrect depending upon what you mean. I would also suggest that the Catholic beliefs about Mary cannot be wholly applied to the Orthodox, as there is a difference in emphasis.
Orthodox no more pray "to" Mary than you ask a friend to pray for you when you are undergoing trouble in your life. No faithful Orthodox believes Mary to be a deity.
Mary's life and submission to the will of God points to Christ, which is why the Orthodox venerate her as important. She is the one person in the whole of human history through which God chose to be Incarnate. That's kind of a big deal, and it makes sense that she would be given a lot of honor.
For this reason, at the Council of Ephesus (431) about 100 years after the legalization of Christianity in the Roman Empire, Mary was declared to be the "Theotokos," which means "Mother of God." No one believes that she is literally the mother of the Holy Trinity, but it is a statement intended to project - rather forcefully - her importance in the Incarnation of Jesus Christ, our Lord and Savior.
As to the saints.
We are surrounded, are we not, by a great cloud of witnesses? If the Resurrection is real, and if the Transfiguration is to be believed, then those in Heaven are more alive than you and me! This is clear from the book of Hebrews and elsewhere, too. We have no reason to think that those in Heaven are not able to intercede for us.
Even growing up in a Bible church, I believed that my dead relatives who had strong faith were "looking down" on me somehow.
It is worth asking what the earliest Christians did, and whether they felt it was worthwhile to venerate the memory, and ask the prayers, of those who had died in great faith and as martyrs. The early days of the Christian church confirm that they did.
All of this is not to say that there are not Orthodox Christians who go astray, of course there are. The Orthodox Church is filled with imperfect people, as all churches are. However, it would be incorrect to ascribe the feelings of some who have left the Church to all Orthodox Christians.
One last thing: to your final point, about preaching the Gospel. Growing up in several different large Protestant churches, I rarely heard the Word of God actually read and talked about. Usually, the preacher would talk about what was in the Scriptures, but layer onto it a lot of personal opinion and conjecture.
The Orthodox services are filled with Scripture and in fact almost every line of the Divine Liturgy, as well as the Vespers service usually practiced on Saturday evenings, are from Scripture. Orthodox monastics read the entire Book of Psalms every week, and Orthodox bishops are expected to know it by heart before being tonsured.
Just a few things to hopefully add to this discussion. On a side note, while newly registered, I have enjoyed SermonIndex for years and have found much edifying material here!