Please, you sound like someone who started watching volleyball in September 2015 De Cecco is not in a good shape, but he is a great setter, among the best in the new generation and he is surely not overrated. In a bad state right now at most.
Maybe it's you the one who started not so time ago and I tell you why (just kidding) 10 years ago De Cecco wouldn't have been considered among the best ones at all, because the overall level was by far better than now (Ricardo, Meoni, Grbic, Ball, Zagumny etc.). De Cecco is a good setter as I said, but has a lot of weaknesses and the biggest one is the poor ability to properly distribute the balls to all his teammates, he don't involve all of them. That's a problem that he has always had, since the seasons in Monza.
Do you wanna know who else considers him good, but also overrated for example? Fabio Vullo, a guy who started watching volleyball since several years