No doubt Jordan is the greatest of all times, but as a talent coming through high school or college....Lebron james is on a pretty high level in my opinion at least. 
Just about every NBA player has come through College, Lebron is different as he went straight from high school to the NBA. Jordan for example went to North Carolina. Really only the international players like Yau Ming didn't come from College teams, but even some of them played for a College, like Bogut (Aussie) play for Utah Uni before he was drafted... 
I'm sure there are others there that didn't play college ball but it's pretty rare. It's why Lebron is pretty amazing.