Overrated means that everybody thinks he is good but he isn't. De Rossi is good and with his age he can became even greater. Overrated isn't a good word for him.
Serious guys, De Rossi would be great. He is young and very talentfull. In my opinion the signing we need this season. Vieira, Pires, Zanetti etc are also good, but De Rossi is very good and the most important, very young. Buy him!!!