UNED is not as bad as you say. It's not the scum of universities, it's just different.
You have to bear in mind that it's not like a normal university. It have no classrooms and students have to make a great effort studying on their own.
It's based in associateed centers spread all over spain and some in other countries, where some tutorship classes are given. Not all the centers have tutors for all the studies. But you can do your exams of any carrer in your associated center. Every student must choose one, the closer to their job, home,... and it can be changed along the year without any problem.
In the last years uned is improving constantly the web resources and some courses are also in internet.
Int he 80's and 90's there was also a great number of new students in all the universities, and those who couldn't get the carrer they wanted , finally choosed uned as the last option. So there were the typical students of UNED, rural areas without universities, people working that haven't time to go to classes at a normal university, people who feel too 'old' to go to a normal university among young people,....and those new who just couldn't get to the normal university.
and so uned become suddenly the 1st or 2nd university of spain in number of students.
The most important carreer is still Derecho (laws), but Informatica de Sistemas and Informatica de Gestion are very required.
This year are new carreers and some old ones have been renewed.
Also, UNED titles are well rated in the private companies as the students is almost alone along the years of the carrer.
www.uned.es