As much as the ref fucked it up, you have to lay the blame solely on Tuchel and the bottling PSG players. Their mentality at this stage is more of fear than pedigree and it's not a coincidence they kept bottling it. The United lineup was so so poor, they literally had no players left. PSG should have won this match 10 times out of 10, let alone drawing, let alone losing at that stage.
OGS is the real deal unfortunately. I suspected it long enough since his brilliant start, but he has played enough tough teams in that run to be just pure luck. I seriously suspect Fergie is giving a lot of coaching tips behind the scenes as well, his style is far too similar. That team had no way in hell to get a result at Paris. If Wenger put out a similar team it will be 8-2.
The teams in europe are so poor nowdays I am a little afraid one of the English teams will win it. I think it will be left with Bayern, Ajax, Porto, Atletico and Barca of which none are seriously consistent enough to trust.