I personally think that maybe Napoli can do better this time. They haven't been regularly joining the Champions League above all else. Therefore there was some lack of experience. They still did great last season of course. Because they made it to the quarter finals. However they couldn't deal with Milan obstacle despite a big effort.
But this time I will be expecting an even more competitive and aware team. They should be able to develop better strategies against especially the experienced teams of the tournament. When it comes to their group now I can just say it is quite easy for them. We should be watching a tough fight between Napoli and Real Madrid for advancing as the leader.
Last season was probably one of Napoli's biggest milestones in the champions league and I agree they just need to get used to this competition to get something better. Even now, the Napoli squad is still filled with defensive players and all of them will only have to develop their abilities further. The champions league competition is the toughest and all the teams are competing against each other to win this title. Napoli's match against Real Madrid in the group phase was the most exciting and we can assume that these two teams will advance to the next round.