They still have no defense. Allowing 8 goals in 8 games is going to get them nowhere. Yes, they are very impressive in attack, yet they are not Barca or Madrid and will not outscore almost every opponent they come up against. They need defensive solidity.
They've managed to get very lucky in the draw and avoid having a single team from a top 5 league (Spain, Germany, England, Italy, France) in their group. As soon as they come up against a "good" team, their defensive deficiencies will be exposed badly. Benfica should have scored 2 goals in the first 15 minutes today, before Napoli turned on the jets and crushed them going forward. Napoli won't be so lucky against better teams with more prolific finishers, nor will they be able to take the game to those teams.
Overrated team, just like Roma was last year after they managed to draw Barca 1-1, and beat us in Serie A.