Maybe not the same level of success, but more hype, but I remember seeing Schea Cotton play at T-More and think he was the most physically impressive player I'd ever seen—legit man vs. boys. I desperately wanted him to come to UConn. Lenny Cooke was it before a fairly unknown Lebron started his ruination. There are good docs on both of those guys.
As a kid, I remember hearing about Damon Bailey for years before he went to IU. He had a very solid career, but it felt like his star started flaming out almost immediately.
Sebastian Telfair had endless hype, and then was exposed pretty quickly.
Tony Mandarich was supposed to be the best OL ever.
Todd Marinovich the first "Robo QB"