How so?
PSG are a good side but not a great one as we continue to see in the CL. So if they are walking that league at a canter and are almost 30 points ahead having tied the title up at the end of Febuary and the 2nd placed team is closer to relegation than they are to PSG. That to me doesn't suggest a very strong league.
Lyon the current second best side in France finished rock bottom of their CL group winning only one game, behind Zenit, Gent and Valencia. Monaco the 3rd best side finished 3rd in their EL group behind Spurs and Anderlecht also winning only one game. So those teams are not that good.