He's an awful defender. He's unswitchable and terrible at reading the pick'n'roll, which is a very bad combination. Doesn't offer rim protection, he's slow and clueless helping the helper. Reputation of being bad defensively in college and surely lived up to it in Chicago. Really doubt anything changed in a couple of months in DC.
And he scores with below average efficiency. His efficiency actually declined last season.
Plus, he's a RFA so he won't settle for a bargain contract.
Portis is the kind of player I'm hoping the Lakers sign.
Among Washington FAs who can't defend, I'd much rather gamble on Jabari Parker. At least he has that raw shot-making talent. On the verge of becoming a very good scorer if he develops a 3 point shot.