I think the key, is the balance in the class. He's got a PG that will be great at everything but long jump shots once all things are done. A SG that will be a little slow compared to many opponents, but not far behind. Ball handling will be a little weak, but if you set him to a +1 given the lower expected speed, he won't need that BH as much.
The SF won't be a great rebounder, but he'll be great at everything else. But when you consider that both his PG & SG will be 30+ rebounders, that will slightly nulify the need for great rebounding at the SF spot.
Both PFs will have great speed for the post, and elite athleticism in a couple of years. Maybe not 80+ Ath, but combined their going to be better than the starters on the other team.
Assuming the C shows up, he'll be a damn fine center as well. Speed will get up to the mid 50s, perhaps low 60s depending on the evals, and his Ath should hit the upper 60s to 70s, which is damn fine for a Center. He'll also get up to 99 in both Rebounding and LP skills
On top of all of that, they'll all be 70%+ free throw shooters, and all should be 90+ defenders. In the post potential age, this is a great class given that potential.
Best ever? I don't know, you can't really compare it to classes of even a year ago before potential or class limitations, or cut backs in carryover, etc... I believe every BCS job is taken in Crum as well, so you can't really compare it to classes where the first humans got to an elite and was basically competing vs sims for great classes.
Anyone that poopoos this class is crazy, its the best one I've seen since changes to recruit generation, potential, etc.. and I imagine its as good a class as we'll see in a while. Sure there will be a handful of kids better at each position in Crum in their junior season, but very few teams are going to be able to even come close to matching them at every position on any given night.