The organisation FIFPro, which is the World Player's Union, estimates that there are 65,000 professional footballers in the world, so if your definition of what is "world class" was limited to just the top 0.1% of all professional players you'd still be talking about 65 players. I think Rooney...
I've listed the biggest clubs in Europe bar a handful. And he'd get into all of those as a starter. The other week he scored a goal from the halfway line. How often does that happen in Europe's top leagues? A special goal from a talented player.
How many England players of the last 40 years...
For me, He gets into Chelsea, Arsenal, AC Milan, Juventus, Dortmund, Schalke, Marseille, Ajax, Celtic, Benfica, Galatasaray, Olympiakos. That's world class in my book.
There's a difference between being "world class" and being "the best in the world".
If a player would get into at least half of the Top 20 club teams in the world then they have to be regarded as world class, and I believe Rooney probably would do that.