I have not considered them as alternative to formal education in universities. In my country University degrees are highly appreciated. Nevertheless, I have suggested them as previous preparation to be clear before investing time and money in Higher Education; as a complement to formal education to have an up-to-date panorama of determned interest areas; or as a way to explore a subject when the interest is not directly professional. Additionally, as my area is language teaching, MOOCs provide great opportunities to improve language while deepening on interesting knowledge.
la educación es una joya, incluso para quien no estuvo en la universidad, pues el conocimiento es universal, no está acabado ni es la propiedad de alguien, por lo cual los conocimientos de cualquier forma obtenidos , si se certifican son validos