I haven't heard that from people of other clubs such as Sampdoria. They don't always take so kindly to Del Piero. But for instance, many people think Baggio was better than Zidane; perhaps on just being a joy to watch, but not technically. Zidane blows anybody out of the water in the technical facets of the game.
I just couldn't believe my ears/eyes when I heard some Azzurri fans claim Zidane wasn't top ten in the last decade, let alone in history. I mean, clearly this is sheer bias; that's the only way to explain this tomfoolery. If people are claiming stuff like this, of course they'll state Benzema and the rest of the French players are crap when it's just their team chemistry and Domenech.