Print on demand is a technology, pure and simple. Some (many) print on demand books are of excellent quality, indistinguishable from an offset printed book. Almost all scholarly books are printed POD these days, which allows university presses to take risks on books that may only sell 300 copies and keep them in print. Some POD books are shoddily produced, due to printer error, publisher cost-cutting, or some weird combination of the two. But POD itself is value neutral.