Well the first wrong decision from him is that he often keeps the ball when he shouldn't, goes into a dribbling, notices he is going no where and either loses the ball or picks out a pass that gets easily intercepted because at this point the opposition is back in their defensive shape, so yeah he takes too long in a sense. I still feel he is often rushed because he already does something with the ball before he even thinks about what he does. I think the really great midfielders already know what to do with the ball before they even get it, where to pass or which space to run into with it. Modric and Kroos are masters of this. They control the ball and already know where it will go next or if they need to keep it a moment longer. I don't know if you can learn this kind of awareness for the game or if you either have it or not. I damn sure hope though that Pogba can still learn this.
That being said he already had those games for us where I felt he made much smarter decisions with the ball, which where also those where he played in a slightly deeper role.