I never ever understood, nor will i ever understand people rating Grosso. This is just like saying you rate Milan Baros imo. He was always brilliant for his NT, but in club level he was an ordinary player. The same goes for Grosso, he's brilliant going forward, no two ways about that, but he's an average defender.
Honestly there are like 9-10 leftbacks that are better than him.
Edit: Red beat me to it.