1. Do you deny that the official Catholic view of the Orthodox church is that it is heretical?
2. From Orthodoxwiki on the 8th Council(You're Catholic I'll let you find and quote the official Catholic View:
Eighth Ecumenical Council
The Eighth Ecumenical Council was a reunion council held at Constantinople in 879-880. This council was originally accepted and fully endorsed by the papacy in Rome (whose legates were present at the behest of Pope John VIII), but later repudiated by Rome in the 11th century, retroactively regarding the robber council of 869-870 to be ecumenical. The council of 879-880 affirmed the restoration of St. Photius the Great to his see and anathematized any who altered the Nicene-Constantinopolitan Creed, thus condemning the Filioque.
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Ecumenical?
This council is not regarded as ecumenical by all Orthodox Christians, but some major voices in the Orthodox world do so, including 20th century theologians Fr. John S. Romanides and Fr. George Metallinos (both of whom refer repeatedly to the "Eighth and Ninth Ecumenical Councils"), Fr. George Dragas, Metropolitan Hierotheos (Vlachos) of Nafpaktos.
Further, the Encyclical of the Eastern Patriarchs refers explicitly to the "Eighth Ecumenical Council" regarding the synod of 879-880 and was signed by the patriarchs of Constantinople, Jerusalem, Antioch, and Alexandria as well as the Holy Synods of the first three.
Those who regard these councils as ecumenical often characterize the limitation of Ecumenical Councils to only seven to be the result of Jesuit influence in Russia, part of the so-called "Western Captivity of Orthodoxy."
An interesting external attestation to the consideration of this synod to be the Eighth Ecumenical Council is the Roman Catholic Church's Catholic Encyclopedia (1907), which describes the council of 879-880 as the "Pseudosynodus Photiana," noting that the "Orthodox count [it] as the Eighth General Council."[1][2]
The Catholics seemed to think the 8th was failable.
With regard to your last sentiment you fail to acknowledge the Catholic church also considers any schismatic church to be heretical. Certainly the Copts similarly consider the Orthodox and the Catholics to be heretical. There is nothing at all odd about that. The Bishop of Rome left in heresy [heresy being beleifs against the doctrine of the church].
You completely missed the point, brother...
The point is that subsequent Ecumenical Councils in which the Orthodox refused to participate in were still considered infallible Councils by the Catholic Church, which continued to convene councils. Thus, the Council of Florence, Vatican, Trent, etc., were infallible Councils. If a Council was declard null and void by the Catholic Church, such as the Robber-Council of Ephesus, it was so declared by ROME, not by the Eastern Church.
As to the "official" Catholic view of Orthodoxy, I understand that the Orthodox are in schism and not heretics. Heretics teach false dogma, which I am not aware that you teach (although you deny infallible DEFINTIONS made at Trent or Vatican, I believe that we share the same BELIEFS - when we explore the Church's teachings the first 1000 years). I believe that the majority of Orthodox are invincibly ignorant of Rome's position. Thus, I don't believe that the Orthodox are heretics.
Regards