Napoli is overrated because they recruited Conte as their new coach, those high expectations are very wrong in my opinion because it is not easy for Conte to improve the performance of a team that has slumped.
3-0 defeat is very embarrassing in my opinion.
Napoli are no longer a team that won Scudetto two seasons ago and this defeat is shocked but I did not expect Napoli to play so well like two or three seasons ago. They are going to downhill and their fans will get familiar with such disappointed performances very soon. It takes them time like some seasons to rebuild a new squad with new generation of players, to succeed again.
In another match, Roma had a disappointed draw with Cagliari too and they even faced with a loss if Cagliari were more luckily with their shot. With big teams already played so far, only Lazio won but Inter Milan and AC Milan only got draws like Roma. Juventus and Atalanta have yet played their match 1 of the season.