Not a large disappointment for Arsenal as they are still to play the 2nd leg in their home ground. Arsenal were a bit careless in the last moment and Galeno utilized it to score a spectacular goal. I still believe it would be an easy win for arsenal.
The more interesting competition was between Napoli and Barcelona where both these teams are of the same caliber. Lewandowski is keeping Barcelona in the race. The 2nd leg would decide the winning team but it is going to be a competitive one.
Arsenal was defeated and that is what we call a disaster for the club most especially when the defeat happened to them at home in front of the fans, which could have been a big advantage to them.
Barcelona on the other hand played a 1:1 draw with Napoli and even though Barcelona made the first goal record before the equalization, it still felt better and safer for Barcelona but along the line, they missed their steps and there was an equalization but still, we cant compared the condition to that of Arsenal who was defeated in their game.