There is definitely some controversy regarding St. Augustine, since at least for post-schism Orthodox, some of the issues Orthodox have with Catholics are seen to have origin with Augustine’s theology (namely original sin and the Filioque).
So unfortunately, I do think Augustine in the more recent centuries has been the whipping boy for anti-Latin polemics. So much by some that some have thought him not a saint (how could a saint be so theologically wrong) and also because he is the source of the Catholic errors.
However, I think this is all in the polemics of modern Orthodoxy. For sure, he is in our synaxarion (list of saints) and is also in our liturgical books with a dedicated Feast Day. Furthermore, there is also the fifth Ecumenical Council that says:
_We further declare that we hold fast to the decrees of the four Councils, and in every way follow the holy Fathers, Athanasius, Hilary, Basil, Gregory the Theologian, Gregory of Nyssa, Ambrose, Theophilus, John (Chrysostom) of Constantinople, Cyril, Augustine, Proclus, Leo and their writings on the true faith. (Session 1 – Extracts from the Acts: Emperor Justinian’s Letter Read Before the Fathers)
P.S. Do NOT think that if an Orthodox calls him “Blessed” Augustine, that the person is not acknowledging his sainthood. If I’m not mistaken, Pope Gregory referred to him as Blessed Augustine in one of his letters, and St. Photius called him Divine Augustine, and also in Pope Vigilius’ confirmation of the fifth Ecumenical Council:
…and especially the blessed Augustine, who was in very truth illustrious in the Divine Scriptures… The Decretal Letter of Pope Vigilius in Confirmation of the Fifth Synod