About the first goal: Just because Juventus has a keeper called Buffon whose reflexes are brillant doesn't mean every goalie is able to save the ball from close distance.
The second one: he is just as good/bad as De Gea. Because of him United had to struggle through many games. I even think Al Habsi is much better than De Gea, at least by corners, every time my heart stops beating when the opponent gets one

Ali almost kept us in the prem in the last two seasons, but he has been pretty poor so far this season by his starndards