I think the German league, or Bundesliga, is not just a farmer's league. The evidence is that other teams can become champions and compete fiercely against Bayern Munchen. For instance, this season, Bayer Leverkusen has been incredibly strong and capable of leading the standings with a 5-point difference from Bayern Munchen. This differs from the French Ligue 1, where PSG is highly dominant, both financially and in terms of squad quality, as well as consistently leaving their rivals far behind in the league table.
The bundesliga is actually transcending from been the regular league won by a particular person to been such that's been won by any body who plays best, most of the team in the bundesliga at some point got used to the league been won by a certain team and so they were not striving to win the league rather they were just putting on their regular average performance, Bayer Leverkusen seem to have set the pace now and by next season we should start expecting to see more of other team rising to put up a good challenge against Munich just like Leverkusen has just done this season.
PSG has got a different kind of dominance in their domestic league such that they will enjoy this dominance for a very long time because it will take a long time for another team to come up financially to challenge PSG in their domestic league in next few seasons.