Some albergues are nicer than others, in part depending on one's personal style and mood. Many provide more of a service than a consumer product. I'd expect that even the private ones must be quite marginal as "businesses" so I'm not sure I'd like to see them rated in a way that suggests that they are competing for our business. It is definitely useful to have the information on what facilities are available at each albergue, so a person can judge whether that is the service they seek. And I am certainly eager to read comments about people's experiences in various albergues. But a rating system might be very problematic - Granon, for example, could be called "rustic" in camino terms. It would be rated very highly by many pilgrims, but it would not be the choice for many others, even though they might have the greatest respect for it.
A star system (good, better, best) simply wouldn't work due to the extremely subjective nature of the pilgrimage experience. Hostales and pensiones are different and the rating system seems more appropriate.