They were shit for the whole season.
They got a last minute (dodgy) penalty in the 1st half of their duel vs PSG at home that helped them calm down in the second half, were PSG missed a bunch of chances, and for the 2nd leg they lost their best player
They miraculously went through Juve even after Ronaldo scored 2 goals in the Juve stadium, with another 25th hour penalty after a disastrous performance, they were worse than they were this year in the debacle vs Ajax
They went through bayern due to some circumstances like
Ulreich, the game
Navas had or Muller
missing this at the end, for example
They won the final, Liverpool lost their best player in the first 30 minutes, Karius gifted a goal to Benzema, Bale scored a bicycle goal from 20 meters and Karius had another howler.
Now, leaving aside that everything counts in football, you can't look at that team run the past season, and, even after they won, say that they weren't shit, Portugal won an Euro playing like shit, Greece did the same, Chelsea won another CL being dire and with everyone knowing that squad was done for.