I won't blame you if you arrive at that conclusion that the Gunners have failed because by their performance tonight, it was as if they didn't bring their heads to the game and also the fact that players are out injured and serving suspension also kind of dampened the morale of Arsenal.
Arteta's men made so many mistakes, some players playing with not so much effort and the fact that they felt that since they beat Madrid that PSG will be easy was all what led to the game ending in their visitors favor.
Return leg will be extreme and even though PSG will try to employ the same strategy they used tonight on that day, what would make the difference is if Arsenal can be confident, more than they were against Real Madrid because if there's a weak spot PSG are so desperate to cover, it's their defense.
If they felt just because they beat and eliminated Real Madrid then PSG will be easy, lol. That's one of the biggest jokes of this month because even the Real Madrid team that they eliminated is no match for this very PSG side. I just pity those that are underestimating them, those guys are in beast mode and they can take down on any team across Europe now well expect for Barcelona because I rate both of them equally. Those are the two best teams in Europe right now.