I will mostly discuss the filler in this review. At first, I was surprised that it wasn't too bad, and thought that people on here and otherwise were just over exaggerating. Lots of people just don't like when a show slows down or gets lighthearted for a bit. Nadia's stranded island arc is definitely not the worst offender of the filler, and at quite a few points isn't filler at all, progressing the story, both in regards to plot and the romance of Jean and Nadia. But its climax leads not into the final episodes, but more of the filler we just left behind, this time with a lazy, emotion baiting, frustrating love-triangle that makes the audience question Jean and Nadia in the first place. The crux of the issue is that it undoes climatic, romantic developments made during the island arc and leads us to believe Nadia does not care whatsoever for Jean, which lingers over the show's finale. The first half of the show gives us a clear picture of the intended development. Jean is persistent, Nadia is skeptical, they butt heads, but persistence pays off, and Nadia as a result becomes a warmer, more likable person. The filler arcs depict Nadia as unchanging, obnoxious, and make her easy to dislike, dampening the sacrifices she makes at the very end for Jean's sake.
I would recommend that if you do watch Nadia, you see about skipping some of the filler episodes. I would recommend jumping from the climax of the island arc to the 35th episode. This avoids the Africa arc and keeps the mystery and suspense going, while keeping intact Nadia and Jean's relationship.
