As I've stated before, any pursuit of unity between many different Christians is going to have to be more general.
That requires compromise of doctrine and reductionism, which the Orthodox will not accept, and which also we don’t need to accept since there exist schisms that were the result of miscommunication or political factors, and these schisms account for the majority of Christians, so those with actual doctrinal differences from the Orthodox that are material represent only a minority of liturgical Christians, and aliturgical Christians who reject sacramentality we are not equipped to assist.
I would also note that the Orthodox Church is also the only major denomination that entirely rejects the idea of doctrinal development and regards its deposit of faith as pure, apostolic and immutable, so in a sense we are the church that everyone else will have to adjust themselves to (indeed the immutable character of Orthodoxy is largely why I joined, because I could be comfortable that the sacrament of matrimony or other essential Christian beliefs would never be compromised).
The desire to preserve Holy Tradition is so strong among Orthodox that occasionally people less well versed in the history of our church make mistakes in their zeal which cause headaches, but this is a failsafe design, since we err on the side of the status quo rather than Pietistic embrace of innovation and doctrinal pluralism.
We have two creeds that are widely accepted.
Actually, only one, the Nicene, unless you were referring to the version of the Nicene Creed with the filioque and the version without favored by the Eastern churches. This is a complex issue and one of frustration because the filioque is a violation of the canons of the Council of Ephesus, but people are attached to it and wrongly believe it is a defense against errors - it was implemented in Spain as a misguided response to an outbreak of Adoptionism. However some Orthodox have been tolerant of it, such as St. Maximos the Confessor. Thus the potential exists for reconciliation without the complete removal of the Creed. Additionally our recent success in persuading the Lutheran World Federation to drop the filioque is great, but its also a hollow victory when the ELCA tolerates parishes such as “herchurch” in San Francisco, a parish whose beliefs, as far as I can tell, are not in accord with the CF Statement of Faith.
That said, by getting the Lutherans to drop the filioque, and many Anglicans, and getting our icons into the altar at Westminster Abbey and other sacred places in the Anglican communion and elsewhere, and getting our hymns such as Phos Hilarion put in the Book of Common Prayer, and even getting Episcopalians to celebrate our liturgy, it seems we can possibly assimilate these churches, which are very problematic, gradually, although I personally would prefer it if we focused on the Confessional Lutherans such as my friend
@MarkRohfrietsch with whom we actually agree with on most issues of eucharistic and moral theology. Indeed everything
@ViaCrucis writes on CF feels like it could have been ripped from the pages not only of The Orthodox Church by Metropolitan Kallistos Ware, memory eternal, but the pages of Orthodox Dogmatic Theology by Protopresbyter Michael Pomazansky and other figures who could be regarded as Orthodox hardliners. And I have no doubt that the LCMS, like the Orthodox, will hold the line on human sexuality and other important issues of moral theology where Pietism and Latitudinarianism have led to compromises in other churches - indeed the LCMS was historically regarded as a mainline Lutheran denomination existing in the same space as those synods which merged into ELCA, and actually initiated the development of the controversial 1978 Lutheran Book of Worship. But fortunately they pulled out at the right moment, and had the courage to sack dissenting seminarians from Concordia during the Seminex fiasco.