As a reformed Christian who has been in many "reformed" churches around the country, I disagree with your assessment. We have a lot to learn from the rich tradition of our past (and yes, the Orthodox and Catholic traditions are a part of our past). Luther diverged from the Catholic Church on a critical point of theology, but he didn't seek to destroy what came before. Even Melancthon sought the advice of the Orthodox clerics. As reformed Christians entrusted with the Gospel of Christ, we should proceed with humility in the Spirit.