Dorky tall kid who can shoot is the best college baller in the land? I seriously doubt it. The NBA sure as hell doesn't think so and neither do I.
I can think of several players better than him.
They're talking about the best player in "college basketball," not the best "NBA prospect." Evan Turner was player of the year in college and is just a serviceable starter with a small number of notable skills who plays for a lottery team in the NBA. Jimmer Fredette was also a player of the year and he's been darn close to a bust in the NBA.
Last time I checked Kaminsky had the highest PER in the country so there is certainly objective quantitative evidence that he is one of the best players in the country.