Bang average.
'The World’s Greatest Athlete' feels like a mixture of stuff we've seen before in this era of Disney. It doesn't do enough to make an impact on me, not helped by silliness of the story and meh casting.
John Amos is the best part of this, I enjoyed what he brings to the table here. Away from him I'm struggling to remember any others already, Roscoe Lee Browne - who is in one of my favourite films, 'Treasure Planet' - is alright but I found his character boring.
I think there's actually potential there with the overall premise, but as usual with this studio's early decades they choose to make it dumb and silly rather than meaningful - it would take a load of tweaking, but I reckon this would make a better coming-of-age/underdog story with a more proper tone. That would make it a completely different film, admittedly.
Lastly, the score is surprisingly solid while the end scene is its most amusing moment. Those two things and Amos aside, this is a bland one.