ronaldo tries hard mate, when he played for brazil it was blatent he wasnt fit for most matches, look at the england match he was doing pretty much nothing and came off early in many matches.
Real Madrid wanted him 100% fully fit they r not gonna play 70% fit players when they have plenty of others to fill in his place and he had a thigh injury in training which prevented him getting back earlier.
So lets not accuse ronaldo of anything, not every body is the same some will come back as strong as ever from injury and some will take time.
Before the World cup this yr he had been playing for inter on a regular basis iirc
1996/97 - 17 games, 15 goals
1997/98 - 18 games, 10 goals
1998/99 - 8 games, 7 goals
99/2000 - 3 game , 1 goal
2000/01 - 0 games
2001/02 - 10 games, 9 goals