Simply put, Ronaldo is amazing. Right now, after his knee surgery and all the crap he's been through, he is still one of the top strikers in the world.
When Ronaldo was in "top" form, he was the best striker in the world; he could beat any defender or keeper with his strength and absolute sick acceleration.
The high demands of professional soccer have taken a great toll on his body, with surgery on his knee and whatnot, but to survive this long in the top leagues of the world, and still be one of the top goal scorers, is simply amazing, part freakish.
Where are any of you getting that Ronaldo is fat? I have a friend who's Brazillian, went to Brazil some time ago to see them play; he said that when Ronaldo took off his shirt, he had the most ripped abs ever. He is a muscle machine, a 'fast' muscle machine at that. He would not be starting over so many great forwards if he were not fit. As a professional, you have to be in the best shape of your life, all the time.
After this World Cup 2006, Ronaldo will surely soon retire, as he has mentioned; up until then though, he definitely deserves a starting spot over Robinho, Adriano; not to say that these aren't good players, they are definitely quality rising talent. However, they just don't have that striker's instinct that Ronaldo does, who can change a whole game in a matter of seconds.
If you don't believe me, watch him in this World Cup. I can almost guarantee that he will be the front runner in Brazil's powerful run to win it all.
Play with your heart.