different time different age. Back then there were no players that score 70 goals every season like Ronaldo and Messi. The best strikers would score in the twenties and thirty goals would be a phenomena!
Kaka himself admitted that he was the last human to win the ballon d'or before Ronaldo and Messi took football to a whole new level. I wonder whether the next generation will have such free-scoring players or will they be more like Suarez, Neymar, Cavani, etc.. scoring 30 goals on a very good season.
I also think the reason behind Ronaldo and Messi scoring so many goals are the players surrounding them,
Messi has played for the best club team in history, that Barca side from 2008-2013 reached a level never been touched before,
look at Messi playing for the national team, he's not even half the player he is at Barca.
Ronaldo as well, the whole Madrid team is built for him to score goals. Did you know that Benzema has more assists than Xavi and Iniesta after arriving in Spain, that's a crazy stat..
But the quality of those two players cannot be doubted either, especially Ronaldo. He tore apart the Premier league and went on to do the same in Spain, extremely impressive.