I have not been impressed by Okafor today. I don't think he has an elite motor. He currently doesn't have much range to space the floor with his shooting. I don't think he will do a good job guarding centers or protecting the rim defensively. Which isn't so much a strength issue, as it is an athleticism and defensive technique issue. He seems like he is reaching too much defensively and has poor balance.
Right now Okafor is a power forward and an average defender at that spot. He will rebound well, especially with the stacked front court the 76ers are rolling out. He has a great back to the basket and fadeaway game. But because of his limitations defensively, he's going to either need to play with a center who can space the floor for him (it won't be Noel) or a power forward who can shoot and defend really well or he's going to have to extend his range to three-point range in order to really make an impact. Right now I think his best case scenario is a rich-mans Kevin Love (Bigger size, better post game) if he can extend his shooting range.