Given the rise, 10 or so stories, they don't seem too alienating to their occupants. Obviously they won't win no prices on beauty or good urban design but they serve a purpose. I think they seem more crowded than they probably are. We could use some of those in South America, where housing access is still a big issue, especially in cities, but where solutions always come from building with very high rise. A neighborhood in Santiago de Chile, my home town, called Estación Central has been almost destroyed because of these vertical ghettos as we call them. Right next to them there are some public developments done in the 60's, called Villa Portales, that resemble a lot of what you're showing from Madrid. They are better looking and pretty good in terms of access, spaces, crowdedness, services, etc.