Please don't throw tomatoes at me, but the first anime that came to mind when I thought of the subject of this thread was Mobile Suit Gundam AGE.
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I know it's not a masterpiece, it's far from it, but as someone who had heard for YEARS from the Gundam fandom how bad it was and how it was one of the worst Gundam series with one of the worst protagonists in the third arc, I actually thought it was great. Overhated, even.
One of the things I really liked about it is that the protagonists of each arc of the series was a different generation in the same family. Like the second arc's protagonist is the son of the first arc's protagonist and the third arc's protagonist is the son of the second arc's protagonist. It's because of that a major theme of the series is the conflicting beliefs between different generations and how hatred from older generations can affect the younger generation.
Honestly, it's a very interesting watch imo.