PSG should have themselves to blame for not having a clinical finish, you don't miss clear-cut scoring chances at this semi-final stage this is not a group stage match, Neymar has been the major culprit here once you missed your chances your opponent will take advantage of it and punish you, that was what played out yesterday Man City utilized their chances and scored their goals while a red card to GANA compounded PSG problems, however Man City can still redeem their image in the second leg if they up their game its not over yet.
I do believe that PSG played as well as they can, they played hard as well, they were tackling hard, they were marking their man very well, they were pressure very well, they were defending even on City defense lines, so they did everything they could. Sometimes there are times when you are just unlucky and there is nothing you can do about it, this is just coincidence and that's about it. This is why there is nothing they could have done, it is just pure unlucky situation and that's it.
City played well too by the way, not like it was an undeserving win for them neither, they were totally fine and I believe it will probably be City that goes up as well, that is still keeping its probability, however PSG wasn't to blame here, City is just a very good team and PSG was just unlucky when you combine these two things together that happens to be the result in the end.