Commenting on this issue as neither a Barcelona fan nor a fan of PSG but a fan of football and most of all a CHELSEA fan.
Lets be reasonable here and not be sentimental abt this barca and PSG fuss. Most people wanted/believed Barca were already out of the competition after a first leg trashing by the Lig 1 Champions, so accepting yesterday's result was very difficult for most of us. But If you analyse the game from a different perspective you will see that neither UEFA nor the ref is tp be blamed.
Here are few reasons why I said so based on my own Analysis.

1. The penalties were not the match decider. Sergio Roberto's goal took Barcelona to the next round not the penalty.
2. For those saying that the 5mins extra time was too much should also remember that the 5mins was not for Barcelona alone. It was for both teams involved in the match.
3. PSG is not a good team. My beloved Chelsea had a red card against the Almighty Barcelona in the semi final with ONLY a 1:0 home win advantage and they still advanced to the next round. compare this with PSG's 4:0 win advantage, not forgetin d fact that Barcelona was also awarded a penalty against chelsea... PSG is NOT a good team..
5. We should all congratulate Barca players, they tried and deserves our respect..

In Football anything can happen except Arsenal is involved.

You have said the truth.

seriously, must barca always be awarded pk in return legs once you beat them in the first leg?
Chelsea team was a "die there" team, that was why.

PSG, worse team ever.
Kudos to Barcelona jare, even if the ref assist as wailers keep on lamenting, was he the one that put the goal in?? Or did anyone even see it possible that Barca could score 3 goals in 7 minutes under all that pressure.
Abeg make una no reason this matter again, PSG na flop. Even Arsenal's loss gan is lesser shame than PSG's.