The Orthodox church makes such a song and dance of where it is and the fact that She Is The One True Only Apostolic and Holy Catholic Church and separates herself from others of the same faith, no less, who she is not in communion with while making grand statements that ekklesia and the companionship of others is of paramount importance to her and indeed the very definition of church to some -- or so i'm led to believeI can totally sympathize with this statement. When I started looking into Orthodoxy I felt the same way. Although I do understand WHY the Church does not commune with other Christians, I still see how this can be a major sticking point.
Yes, this was a problem I had for a few years myself.
The problem comes in here:
separates herself from others of the same faith,
The answer, of course, is that if we had the same faith we would not be separated. Most Evangelicals, for example, deny the ability of God's Grace to act in the world through physical vehicles such as bread and wine, marriages, ordination, holy unction, relics, icons, etc. By denying the Mysteries they separate themselves from Orthodoxy.
Calvinism, as a heresy, has no place in Orthodoxy. Most Christians would agree with our rejection of Arianism, yet would cry at our rejection of Presbyterianism, though both are heretical.
Traditional Lutherans and High Church Anglicans are closer to Orthodoxy than any other group, but the former still deny the intercession of the saints and the latter are yoked with Low and Broad Church Anglicans who flat out reject the Mysteries as well as the last three ecumenical councils (IIRC Lutherans have this problem, as well). Add to this the problems of the last century where certain factions of God and Christ denying teachers have gained a substantial foothold in the leadership of both denominations in the Western world( though as Lutherans make up several different denominations in the US this is mitigated somewhat), to the point where a large swath of US and Canadian parishes are no longer even recognizable as Christian, and Orthodoxy is wise to stand apart.
As for Rome- well, I would hope a Protestant could understand the reason for not rushing into reunion. Let's just say it starts with a "P", rhymes with "hope", and believes that all Patriarchs must submit to him for ordination to their position.
Saying "We all believe in Jesus" is all well and good, but at the end of the day do we all believe the same thing about Jesus? If the Orthodox are right about the Eucharist being the Body and Blood, and that one who does not recognize this eats and drinks his own damnation, isn't it the height of charity to refrain from allowing others to the chalice? In the other direction, as an Orthodox Christian who can receive the Body and Blood in its fullness, why would I want to sit down to a symbolic piece of Saltine and a shot-glass of Welch's?
Now that I am Orthodox, btw, I don't look back on my Evangelical upbringing or my adult years as an Anglican as being profitless, or as not having been Christian. I merely see it as a 20 year Catechumenate. My Baptist family taught me the basics of faith, the milk and water a child requires. My Anglican years prepared me for more sound teaching and acclimated me to Sacramental theology, it was like pb&j. Orthodoxy gives me meat and wine- I am no longer a child with grape juice in my glass playing at drinking wine, I no longer sit at the kid's table at the Marriage Feast.