Did Giovinco play that badly yesterday? I really don't think so. Like I said in a long post some time ago, his problem is psychological. In recent U-21 games, he always played quite selfish (too much dribbling and all that kind of stuff), but that's not his playing style as I have seen him play differently in other games.
I noticed that he was very nerverous yesterday and I think he was too eager to prove himself but did it in a wrong way. So mentally he isn't mature and needs to learn and grow.
Also he lacks the ability to decide a game. He is not a "goleador" (someone we can score many goals as Del Piero). One thing he should improve is his shooting and finishing considering it would be far more difficult for him to improve the defensive skills. The achivement of football is, after all, to put the ball in the net and win the game. Giovinco is good at dribbling, connecting and passing, but if the whole team, especially the finishers are not in form, his indecisiveness in finishing would be noted as in a moment when the whole team is bad, he can't lead the team into victory alone as the likes of Del Piero, Roberto Baggio, Kaka and etc, who always score important goals in difficult times.