Where shot-stopping is concerned, Marco Silvestri is better than good.
His performance at Cardiff was an example of his biggest talent - his speed of reaction to efforts which would easily beat others.
What Silvestri lacks is all-round ability; good control of his area, effective distribution, decision-making under high balls.
Those are obvious weaknesses but you would like to think that, for a 'keeper of his age, they could be coached into him.
The instinctive aspect is not a problem.