I believe that by now we should have been used to their pattern and shouldn't expect too much from them. I know that Arsenal wouldn't be able to win PSG in France because they're the strongest over there. PSG was able to kick out Liverpool who has already won the league. Arsenal cannot stop them.
The game level of PSG is bigger than Arsenal but you know everyone is fighting for the best, that will not be consider as everyone will want to play well and givea excuses later. However, this is the best I can say Arsenal has come close though, they put in a really good fight but no way they are going to win Inter in the final this way they played PSG.
They are going to finish the season among the top team and that's another chance to try again. I just fear that Arteta might be relief from his job, he hasn't been able to win something big for the club ever since he joined the club, no big Europa league for the club and it's disappointing.