Here's a quote from Adolf von Harnack on Marcion and the OT:
"To reject the Old Testament in the second century was a mistake which the Church rightly repudiated; to retain it in the sixteenth century was a fate which the Reformtion could not yet avoid; but to continue to keep it in Protestantism as a canonical document after the nineteenth century is the consequence of religious and ecclesiastical paralysis" (Marcion, 418).
Well not much to say after that one!
