My husband and I walked the Camino Portugués from Lisboa in 2013. It is a long stretch to Porto--there are few hostels and fewer pilgrims. (Until Porto, we only met 5 or 6 pilgrims.) The way is well-marked, but there are long sections of industrial walking and few hostels. The good news is that the inns are relatively inexpensive and for only a few Euros more than what we spent on albergues in Spain we had private accommodations. The food is delicious in Portugal.
Though the Camino infrastructure is sketchy compared to Spain's, I know that several organizations are working on improving it. As the number of pilgrims increases, towns and businesses will see the need and respond.
It is a lovely Camino, and I am glad to have made it. Though I missed the camaraderie of the Camino Francés, the Camino Portugués had other offerings and lessons for me to learn.