In the US you have Orthodox denominationalism, not unlike protestant denominations.
Certainly the church has given in to denominationalism, the problem is just more acute in North America. Take divorce for example
The church will permit up to, but not more than, three marriages for any Orthodox Christian. If both partners are entering a second or third marriage, another form of the marriage ceremony is conducted, much more subdued and penitential in character. Marriages end either through the death of one of the partners or through ecclesiastical recognition of divorce. The Church grants "ecclesiastical divorces" on the basis of the exception given by Christ to his general prohibition of the practice. The Church has frequently deplored the rise of divorce and generally sees divorce as a tragic failure. Yet, the Orthodox Church also recognizes that sometimes the spiritual well-being of Christians caught in a broken and essentially nonexistent marriage justifies a divorce, with the right of one or both of the partners to remarry. Each parish priest is required to do all he can to help couples resolve their differences. If they cannot, and they obtain a civil divorce, they may apply for an ecclesiastical divorce in some jurisdictions of the Orthodox Church. In others, the judgment is left to the parish priest when and if a civilly divorced person seeks to remarry.http://www.goarch.org/en/ourfaith/articles/article7101.asp
Those Orthodox jurisdictions which issue ecclesiastical divorces require a thorough evaluation of the situation, and the appearance of the civilly divorced couple before a local ecclesiastical court, where another investigation is made. Only after an ecclesiastical divorce is issued by the presiding bishop can they apply for an ecclesiastical license to remarry.
This reflects a different sacramental understanding (since it's centered around the dissolution of a sacrament), and one can get that different understanding by just driving down the street. The same is true with the reception of converts. One may need to be received by triple immersion, by chrismation, or simply by confession depending on who you talk to. You could also point to individuals and entire parishes being excommunicated by one church and then simply moving to the care of another bishop as if nothing happened. The nationally and ethnically based divisions of the church in the U.S. just give the added appearance of denominationalism (Constantinople said phyletism is a sin, but it has become our international model of ecclesial governance). On top of that is the congregational polity adopted by most of North American Orthodoxy; which can certainly lend a Protestant feel since the priest can be seen as just the "spiritual leader" of the parish and a hired hand that can be hired or fired at the will of the parish.
Most of these issues are also present in the wider world of Orthodoxy, which may be just the churches in communion with Constantinople, all of the churches of Orthodox lineage (the Old Rite, the various Old Calendarist groups), or other churches of non standard status (like "non canonical" groups comprised of millions of members of various bodies in Ukraine) - the presence of all these groups themselves and the lack of definition of really what it is that comprises the Orthodox Church all just pointing to the basic issue itself. Ask any of the groups listed above who is Orthodox and you will probably get some different combination of answers.