The Nicene Creed is sadly very neglected within Protestantism, which is why you'll see some people denigrating the Creed or its terminology on this forum, particularly when they come from newer, "no creed but the Bible" strands of Protestantism.
That said, the Nicene Creed is part of the official Christian Forums Statement of Faith, so if you do see someone criticizing it, they are violating the rules of the theology forums. Non-Nicene churches furthermore are not regarded as Christian for purposes of participation in General Theology and the other theology forums.
Now, regarding “non-creedal” churches like the Churches of Christ and the Stone/Campbell movement, these groups are accepted on Christian Forums since despite not having a formal creed, they nonetheless agree in doctrine with the Nicene Creed and the rest of the Statement of Faith. Additionally, these groups are of some interest to the Orthodox, since they were among the first Protestants to implement a weekly celebration of the Eucharist and to define their local church ecclesiology in Eucharistic terms. Thus, they belong in the same category as John Wesley and the early Methodists, and the Anglo Catholics, and the early Moravians (the Utraquists) and the Orthodox Lutherans, in that they represent a movement of Protestantism in an Orthodox direction.
It is interesting, by the way, to consider that John Wesley was a contemporary of the Kollyvades Brothers (who were supported by the likes of St. Nicodemus the Hagiorite and St. Macarius of Corinth, the compilers of the
Philokalia) who worked to promote a return to weekly reception of the Eucharist for the Orthodox laity, a cause that would later be taken up at the turn of the 20th century by St. John of Kronstadt.
Thus the movement for a return to high frequency reception of the Eucharist actually occurred almost concurrently within Eastern Orthodoxy and Protestantism.
The difference was that most Protestant churches aside from cathedrals had ceased celebrating the Eucharist weekly, which made things particularly difficult for Protestants wanting to move in this direction.
Conversely, the Orthodox did celebrate the Eucharist weekly - the problem was laity who had grown accustomed to infrequent confession and infrequent communion. A similar situation existed in Roman Catholicism, where most people outside of clergy and the religious orders did not partake weekly.