Gazzetta's ratings are not that accurate, they always rate Materazzi and CZ higher no matter what.
To answer your question, NO. He is brilliant at times like today, but mostly he is inconsistent. What are we going to do with him now that he is near the twilight of his career? A midfielder isn't a striker, defender or a goalie that can be still great in his 30's.
We have a player that is as good as him in Stan who should be our CM. We will play classic 4-4-2 with two wingers and a CM -- DM combo. Stan -- Camibasso complement each other well. If we want re-inforcement, we have Pizarro who is at the peak of his career, and better than Veron.
Also, although it's not very severe, I don't want us to be associated with him after seeing him in that Canna tape. He admitted taking that substance, and I just can't stand having more dopers in the team. That's why I was never thrilled with having Davids.