Many professional sports writers consider Jordan not only the greatest basketball player of all time, but the greatest athlete of all time, even over Babe Ruth, Jim Thorpe, Pele, etc. (the AP poll from about a decade ago put him number 2 after Babe). I think it's a pretty objective fact that saying that he's better than Lebron is not over-rating him.
The greatest athlete of all time is Babe Ruth. Great pitcher, great hitter. Lifted the spirits of Americans everyday during the great depression and was seen as such an icon the Japanese would yell "to hell with Babe Ruth" while charging. No athlete has ever had such an impact on the American people as a whole as Babe Ruth.