He wasn't world class. He was a truly good defender for his years but not world class. Not even close to Nesta's or Costacurta's abilities.
But he was really good for us, he broke his limits.
Barzagli isn't a world class, not even in this years where there aren't so many true world class defenders, but he is givin' his 100 %. I mean, some players are for 7 and play for 9.