Often at times people refer to the French League as farmers leagues or not competitive at all and that's true if you at it critically, the only team in the French League is PSG for the past 14 years or so, the rich owner made sure the club buys the mostly the top player from the other teams in the league thereby reducing the chances of those other teams from competing with them. PSG will keep on struggling in Europe because they face no really competition from their leagues.
La Liga = Real Madrid and Barcelona
Premier League = Manchester City, Liverpool
Serie A = Inter and Napoli
Bundesliga = Bayern and Leverkusen
Portuguese League = Benfica, Porto and Sporting
Turkish League = Galatasaray
In my opinion, the case of Ligue1 is not very different from the other leagues. The fact that PSG constantly becomes champion does not mean that the league is not competitive, the other teams in Ligue1 are not weak, we have seen cases of Ligue1 teams beating other European teams, in the same way that we have seen cases of Premier League teams losing to other European teams.