I don't think that Newcastle will be the points target of the other three teams, even though they haven't felt the atmosphere of the Champions League for a long time, but I'm sure they will still bring their strength like in the EPL. I'm pretty sure other teams will also really count on Newcastle, they won't underestimate the representative from England at all.
For starters, the Newcastle you're seeing now isn't the same as the Newcastle of last season. This season I don't think they can make the top 4 in premier league as they did in the previous years so them progressing from the group stages is also another achievement I don't think they'll be able to achieve. Already their attention is divided with the premier league and the champions league so unless they crash out of the champions league early there's no guarantee they'll do well in the premier league. Lets look at their group, who can they defeat there, no one and those clubs aren't clubs of the premier league that they play often and know their game pattern, they're club outside the premier league and all did very well last champion league season. Experience will be a major factor in this games.
I also expect a better performance from Napoli this season. They managed to keep two of their most important players. With Victor Osimhen and Hvicha Kvaratshelia in the team, their offensive options will always be rich. I think they will beat Braga and Union Berlin with a little bit of comfort, but the games against Real Madrid will give us an idea about their position at the end of the tournament. If they beat Real Madrid and finish first in the group, they will raise expectations. Let's see how they will perform in the Champions League this season.
Napoli were lucky last season, they didn't deserve how far they went to some extent but last season was a good season for the Italians but they might be repeating same successful this season still that doesn't mean they won't be progression from the group stage. They have one of the luckiest draw because they only have to win their two other opponents to progress even if they lost to Real Madrid. Napoli keeping Victor Osimhen and Hvicha Kvaratshelia was surprising as I thought other top clubs would have gotten atleast one of the players. I hope this decision doesn't come back to bite Napoli as it would had been better to cash out huge sum of money on this players after they had a fantastic season last season. There's no guarantee they'll both be phenomenal this season but let's watch and see.