PSG have been in good form in the Champions League so far. But they haven't faced a big team so far. PSG's defense lineup has enough problems. I'm sure when they compete against the best teams in the next round, the defense could be the cause of the defeat. If they want to do well in the Champions League, the defense needs a lot of work.
It is not new to see PSG performing so well in the group stages of the champions league and still fail to win the title. We will see in the next rounds when they compete against stronger and tougher teams how well and prepared they are to compete for the trophy. Real Madrid are my favorite team to win the title this season. PSG lack consistency and always fail to maintain the good form they start with.