I tend to agree with Joe here to a degree. There is however awlways a few exception to the rule. In Gerrards case for example, Zidane labelled him as world class and I believe he certainly was for a long part of his career. He is no longer world class but certainly was and I believe he will remembered as world class.
The argument for Pele, regardless of whether he moved to play at bigger clubs or not, he proved his class on the world stage and had a large influence on the outcome of the world cups that Brazil won.
Batistuta is another who I think was world class.
Suarez, although I have said he is world class is probably borderline. I believe he is the best striker in the prem, he has influenced result for his country on the world stage (not just the deliberate handball

)and I think he would be welcomed in almost any team in the world regadless of whetehr it's club level or country.