It is fair though and Ligue 1 is a one horse race wether you like it or not.
He drew against St. Etienne (total value of squad: 90M) and Rennes (total value: 182M) and lost against Lorient (total value: 52M), Monaco (total value: 331M), Nantes (total value: 83M) and Lille (total value: 242M).
He took over 1 point behind the the league leaders and couldn't catch them in 22 games with a squad worth 891M (#2 in the world)
None of the teams 19 other teams in Ligue 1 would get top 10 in the PL. The least valuable squad in the PL is worth 130M, Ligue 1 has 13 squads worth 90M or less and none of the other 6 squads are worth more than Wolves (ranked #10 in PL)
You have to win the the french league with that squad, that is the absolute minimum....even when you have only 22 games to get 1 whole point more than your rivals
Maybe it is too much to ask of a "world class" manager, but I disagree....
I think we can agree on the fact that he has not gotten the most out of that PSG-squad and there is nothing that suggests he would suddely start winning trophies if he comes here.