He's probably someone you'd put in the same category as Ronaldinho or van Basten, who also had a couple of seasons when they were simply out of this world but who were unable to sustain it for various reasons. Hence you get all of these comments about "he would have been up there with xyz if he didn't have the injuries", but sadly he did, so we'll never know. Some of his performances during those peak years at Barca and Inter were incredible, but then so were those by Ronaldinho and van Basten. To be spoken of as the best striker of all time you have to do that for much longer than Ronaldo has managed. Indeed, given his shift of position, Christiano Ronaldo is quite a way ahead as the best #9 ever given the performances he's put in over such a long period of time. I'd even put someone like Puskas ahead of him for the same reason. You can only deal with what has been, not what might have been.
Terrible summation and comparison.
Longevity is a silly argument. Are the Stones better than the Beatles?
Ronaldo by age 22 had scored over 200 goals, and but for a convulsive fit hours before the ‘98 World Cup final (in a tournament in which he was voted the best player) he would have been named FIFA World Player of the Year for the third straight year. Neither Messi nor Cristiano had got close to winning one by that age.
To compare him with Ronaldinho highlights complete ignorance of his ability. It’s akin to comparing Magic Johnson with Michael Jordan. Ronaldo could do everything Ronaldinho could do, but much faster, with more end product and was a goal machine to boot.
In two World Cups, Ronaldo was the best player (‘98, in his prime), and the top goalscorer (‘02, past his prime). In the Copa America he was the best player (‘97) and top goalscorer (‘99). Ronaldinho never came close to that level at a single tournament nevermind four, neither did Cristiano Ronaldo. Van Basten (completely anonymous in his prime in Italia 90 World Cup) was a great penalty box finisher, but heavily reliant on service. He finished stuff off. Ronaldo was a one man attack who took the centre forward position to a new level by drifting far outfield and running past defenders akin to a wide player/attacking midfielder. He created goals for himself. The team could play badly, but he could win it on his own. The like of Van Basten needed the team to do well for him to do well. Thierry Henry, a similar style of forward to Ronaldo who followed in his footsteps, is widely regarded as the greatest PL player ever...ball park figure but he’s maybe 65% of what Ronaldo was. And mentioning the ilk of Puskas, a slow, unathletic forward when the game was played at walking pace. You may as well bring up some 19th century white prize fighter (Bob Fitzsimmons) and compare him with a supreme athlete like Ali.
Those who worked with Ronaldo (Mourinho, Capello, Robson) say he was the best. Those who played with him (Zidane, Kaka, Vieiri) say he was the best. In his prime that is what he was.