Borussia Dortmund, Arsenal and PSG among others were off colour - but Barcelona disappointed more than anyone else in 2016-17. 2016-17 wasn't a vintage season for several high European clubs generally. The Manchester clubs were out of the title race by March. PSG lost out on the Ligue 1 title to AS Monaco when four productive seasons. Bayern Munich, despite their domestic success, didn't crack the eu code over again.