At the end of the day the series was quite good but that last arc was 90% unnecessary, didn't really add anything other than to prolong the story.
My PERSONAL issue was always the fact that the MC's were much too OP compared to the challenges/antagonists they had to face so i never really got that sense of crisis. All in all it was still an enjoyable read
Honestly speaking? Im glad that dragon arc is finally done. Everything else was fine but that last arc reaaaally dragged things down. I skipped majority of the dragon arc as it failed to grab my attention unlike the rest of the story. Overall 5 out of 7!