He's overrated because he's polished? Isn't he properly rated because he's the most skilled big man in America? Why would you elevate someone who's raw? If the rankings are based on where guys might hypothetically be 10 years from now they're useless.
I said it yesterday, but I don't get excited about guys like Chukwu. Every video I see is him beating up on kids who looked like me in high school. He can probably contribute a bit defensively as a freshman but that's about it. Meanwhile, I think a kid like Okafor is going to have a Jared Sullinger like impact from jump street.
I think you missed where I said he was mediocre defensively. His offensive polish covers his major flaws on defense. Maybe I wasn't as clear as I could have been. If the game was solely offense he would deserve all the hype he has received. I've heard scouts call him the best big they have seen since Oden. That's being overrated, IMO, because Oden was also a beast defensively. Okafor has a long way to go on that end.