I don't think anyone has a problem with Demar when he is attacking and passing. Its when he gets into midrange jumpshot mode we all cringe. He was great for most of the game but he still took 4 or 5 terrible shots and until he eliminates them his efficiency will continue to be poor.
I think his value is in a trade. I don't think you win a championship with Demar at the 2 as his 3 point shooting and defense will never be good enough.