Tom,
Centro Nacional is not in the rankings, it is a poor course on a very, very poor site...It is not very appreciated even locally, but it was the only venue in Madrid that was willing to host the Madrid Masters (formerly Open de Madrid played in Puerta de Hierro) this year.
I can mostly comment on the Spanish courses and as Frank says, best positions are given to those that have PGA visibility:
- Valderrama
- PGA de Catalunya - where the Spanish Open was played this year
- Real Club de Golf de Seville - This year Open de Andalucia and many events in recent times
Amazingly Golf Santander is very highly ranked despite being a new course, with no PGA play, designed by Rees Jones and which is extremely monotonous. I guess the very large and deep bunkers all over the place did make an impact on raters.
Quite amazingly, the ranking does not distinguish which course is rated in facilities with 36 holes (Puerta de Hierro, Club de Campo, El Prat, Emporda, San Roque )