We Orthodox Christians honor the Theotokos Mary more than all the saints and angels of heaven for she was found worthy to give birth to Christ, the Savior of the world by the overshadowing of the Holy Spirit. The honor we render to the Mother of the Lord is exceptional, most honorable and most revered, for she is not only "a friend of His,” as are the other saints, but she is Most Holy (Panagia) above all the saints and all the angels.
For this the angels as much as people venerate and honor her with prayers, hymns, church services and eulogies. Similarly the Archangel Gabriel greeted her at the annunciation (Luke 1:28-29) as well as Saint Elizabeth, the mother of Saint John the Baptist (Luke 1:40-43).