PSG having a better run this time around isn't guaranteed yet. Sure they look like a good team, and they look like a lot better than what they were expected to do which is why I believe that they are looking great at this time, but that doesn't mean that they won't lose. We are going to probably see them be at last sixteen anyways, which they always reached and losing Mbappe will not change that and they will be there anyways. However, last sixteen is the only place I can see them reach for sure, after last sixteen round, we are talking about totally random matchups.
The team is not yet balance since the departure of Mbappe, although they are wining matches because they still have the best team in the French League one, but they will struggle to win the League this season because Monaco looks stronger than they used to be this season with couple of young talented players that have the ability to play and win matches for the team.
PSG and Monaco have the same points (16) points after six games which shows that they will have to be very serious and defeat Monaco before they can win the league one this season.
Depending on who they face, they may do better or do worse and we should not be focusing on anything else. They have a tough time with these opponents if they face someone harder, so maybe they won't do that well. Luis Enrique is a great manager there is no doubt about that, he is a famous one and he did well before, but I believe that he is not going to end up winning UCL with this PSG team, not possible.
Injuries is also contributing to their struggles, and I think Luis Enrique needs to do something really quick to address these because once Monaco take the lead, it will be difficult for PSG to win the title.