I do admit, that fed did benefit from the very weak 03-06 era. the 08-12 era is much stronger, however you have to admit, that nadal did not face a lot of great clay specialists. the 90s and early 00s had so many great clay courters (guga, muster, brugera and the other spaniards, courier...) but which great clay courters played from 05-12? there have been some OK clay courters but in the end he played most finals against federer who is great but certainly no clay specialist. I don't see any great clay courter that he had to beat.