It sums up what I have long thought about this series, it has good production but everything else is mediocre. The production went a long way to mitigate the faults it has and a liberal helping of tournament style events helped too(they are always fairly easy to write and also fairly popular. How many were there so far? 3? 4?). Without these tournament events the issues the anime has start to become more apparent. The protagonist is bland, the supporting characters are hit and miss but mainly miss, there are too many of them and they have a lot of crossover, the antagonists are even worse, they have no goal and don't feel like a villain organisation or a threat at all, just a gang of delinquents. The story has not real progression, this last season was basically filler and because of how simple the world is, the lack of any real goal on the part of the protagonist and the lack of any goal on the part of the antagonists there isn't much room for future development regarding this. I was never a huge fan of the series but I expected more.
