^^^Nadal is a product of the "spanish system" insofar as Toni Colom, Francis Roig, Jofre Porta and even Toni Nadal are all RPT certified coaches.
If you are referring to "system" in the sense of the NGB, no spanish players are a product because RFET don't have a mission to produce players - they don't have the budget for it for one thing. There is a national academy, but in general they are picking up the 7th 8th 9th etc rated players as the top players have so many elite level coaches to choose from.
Don't be upset by the results you didn't get from the work you didn't do...
talkcoaching on wordpress, come check it out :)