Ronaldo has gotten to a stage in his career were he is not able to perform the way he used to when he was at the peak of his career. He has only managed to score just a few goals and few in the world cup too and It is so sad to conclude we are gradually seeing the end of the Ronaldo era. The Saudi league will be a less difficult league for him to flourish but there will be no glory in that and Ronaldo is all about proving himself as the greatest player in the world.
Ronaldo is still a good player, I could remember last season in Manchester United is performance was good. He was the hope of Manchester United then. In the the season he was not used very well to play most games and I think that affected his performance because he was always on the bench. If Ronaldo is becoming weak it would have showed in his performance last season. Ronaldo is still strong at 37.