I may be a bit biased, but I think that overall, across every major team sport (baseball, football, hockey, basketball, soccer, etc), the greatest player ever is Wayne Gretzky. What I mean is: in hockey, he was better than Ruth was in baseball, or Jordan/Russel/Johnson in basketball, or Pelé in soccer, etc.
What do you guys think? If you're confused about what I mean, I can try to clarify. Lets also try to keep this a discussion and not an argument.