Eh, an 18-year-old Ronaldo was good but was very inconsistent with no end product and liked to showboat.
The likes of Rooney, Quaresma and manual other young players were all better than Ronaldo at the time.
Don't think Ronaldo would become the player he is today without Sir Alex Ferguson's guidance.
Let's not use revionist history here about an teenage Ronaldo
Quaresma? The same Quaresma that went to Barca and failed at the same age and time? You're grossly underrating a teenage Ronaldo.
If Quaresma was better at the time, why was it Ronaldo who got selected and starred for Portugal at Euro 2004 and not Quaresma? (who was a year older)
Quaresma displayed a level of talent that indicated he may have been superior to Ronaldo only in the youth ranks but once both left Sporting, Ronaldo left him in the dust.
Rooney was never more talented, he was just at a more advanced stage in his development at the time - with decision making far beyond his years. Once Ronaldo matured himself, he left Rooney in the dust too.
Finally, of course Ronaldo had Sir Alex to thank for a lot of his development too but he wasn't the deciding factor. Ronaldo himself is to thank for his evolution as a player. He almost literally became the best player in the world overnight. He came back from the 2006 WC after all that controversy with Rooney with a chip on shoulder (and we all know how Ronaldo plays when he's pissed off). He took the league by storm; won double PFA player of the year and by the time he was 22 was already the best player in the world. That's more down to his own talent and dedication to his craft than Sir Alex Ferguson's tutelage which was significant but not pivotal. Ferguson himself even downplays his contribution to Ronaldo's success as an individual; saying that the player himself got himself to that level.