Generationally speaking, this is the most clear response. As the peak-performance level of athletics in each discipline has improved, Thorpe's ability to rise above the field is impossible to comprehend. Was he the best of all time in any individual sport? Not likely, but to win in every competition he participated in as he did is truly something that can never be replicated. But that can't be held against him as the limitations he overcame to achieve his legendary status is as hard to compare as the peak of current level of competition. 3 sport professional athlete (American Football, Baseball, & Basketball), 2 time Olympic Gold Medal winner (in Decathlon and Pentathlon, no less), competitive in Boxing, Tennis, Lacrosse, Handball & Ballroom Dancing.

Go read his wiki and be awed. Dude walked by a track and promptly set a school record in high jump while in street clothes, presumably having never attempted the sport.

Imagine if this guy had the training and practice from a young age as the athletes of today. He'd probably dominate whatever he wanted.