Poor decision making for one thing. As well as, you have got to hit open recievers down the field. And he has not done that on a consistant basis for the last 2 years. Now, alot of that has to do with his Offensive Coordinators play calling, no doubt. Personally, as far as a person I like Dak. He keeps his nose clean and you don't hear any bad things about him. But, if you're going to be the starting QB for the Cowboys you have to take care of business on the field !
He reminds me alot of Danny White. He has the tools, but makes poor decisions at the wrong time. But, I will pull for him and the Cowboys every week regardless !