To be fair if you are PSG, then facing Milan, Dortmund and Newcastle shouldn't be a problem for you. I think they should be the leader of that group, they are capable of beating them all, their aim is usually winning the UCL but we know that they fail that but for a team that aims at winning the whole thing, it should not be really considered to be a big trouble to face these teams.
PSG does have some serious rivals, like Madrid, like City, like Bayern, but those are not in the same group, which Real could have been so that's lucky. I think this is why they should not fear this group, and hope to get out with 18 points if they possibly could, but if not, at least go out with the first place to make sure they are doing fine.
I am calling this is reasonable group for the PSG in current circumstances because in this season they have no enough stars and coach is also new even well experienced, but things are not easy for them specially their start is not good and many things are looking for the settlement as soon as possible but most chances they can go through into knockout stage and have enough chances for the staying at the top because AC Milan current form is impressive, and they can give them challenge for the top spot with Borussia Dortmund and Newcastle Untied both are having not well experienced teams for having anything positive from this group.
With most chances we will have no enough chance for the title, but this can turn into good chance for the future with few adjustments and improvement into performance can bring better results, PSG needs to be focused on every game instead of going to be thinking about big dreams which are shattered many times in last few years.