Well, perhaps it´s because he tend to throw the ball away every time he tries to play up field. Yesterday his long high passes to the attackers drove me crazy. 9 out of 10 times he misses his target. He could learn a thing or two from Bonucci when it comes to cool and collected passing, that actually finds it´s target.
And the fact that he sometimes seems to fall asleep in defence doesn´t help either.