5. Serge Ibaka, PF - Toronto Raptors
After signing a 3 year, $64 million contract with the Raptors last year, he hasn't done much to prove that he's worth the contract.
The biggest issue with him is defense as he is unable to defend players in the paint. He allows over 66% shooting against opponents he defends, which is something that needs to change over time.
Nonetheless, 3-point shooting is another issue he has, something which many top power forwards are able to handle. He ranks 33rd against other players at his position for 3P% and at the same time, there are plenty of players who are much more capable on both sides of the ball then Ibaka. We could potentially be seeing Ibaka's last season as a Raptor unless he starts proving his worth.