These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Ashita no Nadja
Crowning Music of Awesome: Every single music piece is great, but especially "Jounetsu" (the Flamenco song), "The Angel that can't fly" (Raphael and Sylvie's duet) and "Waltz Number 5".
Germans Love David Hasselhoff: Considering how many videos in Spanish, Italian, and French there are on Youtube, it's safe to say that this anime is big in Latin speaking countries.
Jerkass Woobie: Initially played straight with Rosemary, though the sympathy could get lost with each act of cruelty she pulls. ( Though it might be recovered with her last scene, with her acknowledging how wrong she was and bowing out willingly (As well as telling Nadja to treasure her mother, whom Rosemary herself kinda cared for as well).
Completely averted with Hermann: despite his final scene (see Alas, Poor Villain / Cry for the Devil on the main page), he's such a bastard that he's never really seen in a sympathetic light by any characters or the audience.
Played straighter with Marianne and Keith. The first is kinda self-centered and stuck-up but her love for Francis is extremely genuine, she cries at some point since Love Hurts, doesn't lie to Nadja or tries to manipulate her, and the scene where she acknowledges her love as impossible and quietly leaves is rather sad. The second is extremely cool as Black Rose, has a decent Freudian Excuse in his mother's death and is humanized by his conflict with Francis, but some of his attitudes to Nadja later in the series can come off as possessiveand self-centered, if not very hypocritical.
Values Dissonance: More than one fans has been shocked to see that Nadja, a very sweet and kind girl who loves animals, approves of and likes bullfighting. This is because the series is set in the first decade of the XX century (and right before World War I!), when there was next to none awareness about animal abuse.