Oh no! Inter fell into a trap. They overcommitted into gaining the lead, which is exactly the strength of PSG's defensive prowess - holding on to a terrifying counter attack. Basically, a team with a persisting attacking force enough to get beneath PSG's defense can easily score the club. Arsenal is a kind of club that pressures PSG, Inter is always likely to lose against PSG.
Inter didn't need much fast attacking playstyle to conquer PSG — that's something PSG excels at. What's very frightening about PSG right now is their midfield. PSG midfield made Liverpool's midfielders look like a joke and even Arsenal midfielders (rice + oddegard) were outworked by PSG's?
A better match up would've been PSG vs Barcelona.