Don't forget that he is a poor defender and poor rebounder even though he's on another planet physically. And he rattles easily. And he takes horrible shots. Playing hard and being smart are as much an inherent trait as athleticism is, and the kid doesn't have those things.
Terrence Jones is a solid rebounder and should be pretty good at the next level. He averaged 9 boards/game and had 14 or 15 in the final game. This is another trait that makes him comparable to Lamar Odom.
I think he has plenty of upside. He's close to 6'9", can handle, pass, rebound and score inside and out. I think of him as being the kind of player you'd expect to see playing on the Hawks. He has some of Josh Smith's explosiveness (not as much, obviously) combined with some of Marvin Williams' intangibles. I think he's quicker than Millsap and should add size and versatility at the SF. He also has some toughness.
Burks could be a nice player too, but I agree with another poster that Hayward is better off at the SG position than SF.